Collins Entertainment Corp. (Collins) brought this action against (1) Coats and Coats Rental Amusement, d/b/a Ponderosa Bingo and Shipwatch Bingo, (2) Wayne Coats, individually, and (3) American Bingo & Gaming Corp. (ABG), alleging various causes of action arising out of ABG’s removal of Collins’ coin machines from Ponderosa Bingo and Shipwatch Bingo. The case was referred to the Charleston County master-in-equity for trial with authority to enter a final judgment. ABG appeals (1) the master’s finding that it intentionally interfered in a lease for the placement of Collins’ video' poker machines in the two business establishments and (2) the punitive damages award. We affirm.

FACTS

T.A. Coats and his wife Darlene owned or operated a business known as Coats and Coats Rental Amusement. *144Wayne Coats, their son, also appears to have been involved in the business.

Coats and Coats Rental Amusement operated two bingo halls, Ponderosa Bingo and Shipwatch Bingo, at two different locations. The locations had been procured by T.A. Coats subject to written real estate leases between him and the individual property owners.

On March 28, 1996, Collins entered into a six-year lease agreement with “Coats and Coats Rental Amusements d/b/a Ponderosa Bingo and Shipwatch Bingo and Wayne Coats, individually” for the exclusive right to lease video poker machines at both locations. The parties were to split the revenues from operating the machines. The agreement further provided that, if the premises were sold, the buyer was to assume the lease. Wayne Coats signed the agreement individually and on behalf of Coats and Coats Rental Amusement.

In 1997, ABG entered into negotiations with T.A. Coats to purchase the assets of the Ponderosa and Shipwatch businesses and to assume the ground leases to the properties on which they operated. The purchase and sale agreement required Coats and Coats to indemnify ABG in the event ABG was sued for interfering with the video poker machine contract. Although T.A. Coats made ABG aware of the agreement with Collins, ABG did not assume the lease and instead removed Collins’ machines from the premises.

Collins then brought this action against Coats and Coats, Wayne Coats, and ABG. In its complaint, Collins asserted a claim for breach of contract against Coats and Coats and Wayne Coats. Collins further asserted causes of action for intentional interference with a contract, civil conspiracy, and unfair trade practices against ABG.

At trial, the master dismissed the civil conspiracy cause of action and found in favor of ABG on the unfair trade practices claim. The master, however, determined ABG was liable for intentional interference with Collins’ contract and awarded actual damages of $157,449.66 and punitive damages of $1,569,013.0o.1 The master denied ABG’s post-trial motions.

*145LAW/ANALYSIS

I. Motion to Amend Answer

ABG first contends the master erred in denying its motion to amend its answer to conform to the evidence presented at trial. We find no error.

In its answer, ABG stated: “This Defendant admits purchasing the businesses known as Ponderosa Bingo and Ship-watch Bingo from Coats & Coats Rental Agreement and Wayne Coats individually.” Before calling any witnesses, Collins’ attorney read this statement into the record verbatim without objection from ABG. At trial, however, Wayne Coats testified that he had no ownership interest in either business when ABG acquired them.

After the close of ABG’s case, Collins’ attorney again read the answer into the record. This time, however, ABG moved to amend the answer to conform to the proof. In support of the motion, counsel for ABG claimed: “At the time the [ajnswer was drafted, that was the information provided us. We would ask that the [p]leadings be conformed to the proof presented.”2 Collins objected to the motion, alleging the entire litigation was based on the admission in ABG’s answer. The master denied the motion to amend.

Citing Rule 15(b) of the South Carolina Rules of Civil Procedure, ABG argues the master should have permitted it to amend its answer to conform to the proof offered.3 We *146agree, however, with Collins that Rule 15(b) is inapplicable to this situation. As this court stated in Sunvillas Homeowners Ass’n v. Square D Co.:

The rule covers two situations. First, if an issue not raised by the pleadings is tried by express or implied consent of the parties the court may permit amendment of the pleadings to reflect the issue. Second, if a party objects to the introduction of evidence as not being within the pleadings the court may permit amendment of the pleadings subject to a right to grant a continuance if necessary.4

Here, the issue prompting ABG’s motion to amend was raised in the complaint and admitted by ABG; therefore, the first situation did not apply. Moreover, because no objection was made as to any evidence being outside the pleadings, the master could not have permitted an amendment pursuant to the second part of the rule.

II. Interference with Contractual Relations

A.

ABG asserts Collins failed to prove the elements of intentional interference with contractual relations. In our view, however, the record has sufficient evidence to support a finding that Collins proved each of the necessary elements.

“The elements of a cause of action for tortious interference with contract are: (1) existence of a valid contract; (2) the wrongdoer’s knowledge thereof; (3) his intentional procurement of its breach; (4) the absence of justification; and (5) resulting damages.”5

At trial, ABG contended (1) the parties to the contracts for placement of the video poker machines at Ponderosa Bingo and Shipwatch Bingo were Collins, Wayne Coats, and an entity called Coats and Coats Rental Amusement owned by Wayne Coats; (2) the entity known as Coats and Coats Rental *147Amusement that was owned by Wayne Coats was a North Carolina entity and separate and distinct from the Coats and Coats owned by T.A. and Darlene Coats; and (3) T.A. Coats held the ground lease on the properties where the businesses were located. ABG maintained that, because it negotiated with only T.A. Coats for the ground leases, it could not have interfered with the video poker machine agreement giving Collins the exclusive right to place its machines at Ponderosa Bingo and Shipwatch Bingo, as that agreement did not involve T.A. Coats.

The master,' however, found that Coats and Coats was a business “consisting of Wayne Coats’ mother and father, T.A. Coats, Wayne Coats, and Darlene Coats” and that “T.A. Coats, Darlene Coats, and Wayne Coats operated various aspects of the Ponderosa and Shipwatch businesses under various trade names including Coats and Coats, Coats and Coats Rental Amusements, and Darlene’s Rental and Amusements, all of which were run and controlled by T.A. Coats.” The master then determined that the “contract between Collins and Coats and Coats was negotiated by T.A. Coats and signed by Wayne Coats at his direction and under the authority of T.A. Coats.” Finally, the master concluded that “T.A. Coats ratified this contract by his actions subsequent to the placement of Collins Machines at the Shipwatch and Ponderosa locations.”

In his deposition, T.A. Coats testified he negotiated the contracts for the video poker machines to be placed in the Ponderosa and Shipwatch locations.6 He further explained that, because he was out of town when Collins’ representative brought the machines, he instructed Wayne Coats to sign the contracts so the machines could be left on the premises. Finally, T.A. Coats testified that the Coats and Coats entity that was a party to the Collins agreement was his business and, furthermore, that the Coats and Coats entity that Wayne Coats established was not in existence at that time.7

*148Based on the foregoing, we hold the record contains evidence to support the master’s determination that Collins’ contract was with T.A. Coats and not with Wayne Coats. Although Wayne Coats may have signed the agreement, the record supports the finding that he did this only with express authorization from T.A. Coats to act on behalf of T.A. Coats and Coats and Coats Rental Amusement.8

B.

ABG next contends it had no knowledge of any contract between Collins and T.A. Coats and was told that Wayne had the video poker lease. The record, however, supports the finding that ABG knew that T.A. Coats was a party to the contract at issue.

T.A. Coats testified that he told Greg Wilson, Roy Stevens, Richard Henry, and Barry Goldstein, all of ABG, that he had a contract with Collins for the video poker machines. In addition, ten of Collins’ video poker machines were present in each location and, as required by state law, were clearly marked as belonging to Collins. T.A. Coats further stated he told individuals at ABG that he was not going to breach the agreement and that ABG had to remove Collins’ machines and contact Collins. Roy Stevens, ABG’s state manager, testified he knew of the video poker lease with Collins and ABG had a copy of the contract to review. Barry Goldstein testified that a copy of the Collins lease was passed around ABG “like the Sunday comic strip.”

C.

ABG further asserts there was no evidence presented at trial that it either induced or coerced T.A. Coats or Wayne Coats into breaching the video poker lease. We disagree.

*149According to Roy Stevens, the purchase and sale agreement was structured in such a way as to circumvent the Collins agreement. Stevens further testified that, if T.A. Coats refused to sell, ABG intended to run him out of business. In addition, Wayne Coats testified that (1) his family never contemplated cancelling the Collins agreement until ABG was involved; (2) an attempt was made to have ABG assume the Collins contract; and (3) a representative from ABG advised his parents that “if they didn’t sell out, that American Bingo would eventually run them out.”

D.

Finally, ABG argues it was justified in its actions because it believed that the Collins agreement was with Wayne Coats and that T.A. Coats held only the ground leases on the properties. As discussed above, however, there was ample evidence to show that T.A. Coats was a party to the Collins agreement and that ABG was aware of his involvement.

III. Expert Testimony

ABG asserts the testimony from Coffins’ economic expert, Dr. Woodside, regarding Coffins’ excess capacity of video poker machines was hearsay and, therefore, the master improperly relied on this testimony in calculating damages. We hold the admission of Dr. Woodside’s testimony was proper.

Dr. Woodside testified that Coffins maintained warehouses with additional machines. He testified that, although he did not know exactly how many machines Coffins had in its warehouses, individuals with Coffins had informed him that Collins had sufficient excess capacity to fulfill both the contract with T.A. Coats and any subsequent contracts. In addition, Dr. Woodside testified Coffins routinely rotated machines from one location to another.

ABG argues that what Collins’ employees had told Dr. Woodside was hearsay. We agree the information was hearsay, but hold, however, that it was nevertheless admissible under Rule 703 of the South Carolina Rules of Evidence.9

*150The admission or exclusion of expert testimony is a matter within the sound discretion of the trial court.10 With regard to information on which an expert opinion is based, the South Carolina Rules of Evidence provide as follows:

The facts or data in the particular case upon which an expert bases an opinion or inference may be those perceived by or made known to the expert at or before the hearing. If of a type reasonably relied upon by experts in the particular field in forming opinions or inferences upon the subject, the facts or data need not be admissible in evidence.11

Here, Dr. Woodside relied on the information provided by Collins’ employees to determine how to calculate Collins’ damages. In order to do this, he needed to assess Collins’ excess inventory of machines vis-a-vis the number of locations it had available in which to place these machines. We therefore hold the hearsay testimony was the “type reasonably relied upon by experts in the particular field” when determining how to calculate damages and the master did not abuse his discretion in admitting the testimony.12

IV. Lost Volume Seller Doctrine

ABG maintains the master erred in applying the “lost volume seller” doctrine and in holding Collins did not have to mitigate its damages. We disagree.

*151The theory behind the “lost volume seller” doctrine is as follows:

If the injured party could and would have entered into the subsequent contract, even if the contract had not been broken, and could have had the benefit of both, he can be said to have “lost volume” and the subsequent transaction is not a substitute for the broken contract. The injured party’s damages are then based on the net profit that he has lost as a result of the broken contract.13

South Carolina does not require a party to make an unreasonable effort to mitigate.14 Moreover, once Collins showed it had sufficient inventory “to place as many [machines] as it could have found customers for,”15 it likewise established that any other deals it would have made would have been in addition to, rather than instead of, the prior agreement. We therefore affirm the master’s use of the “lost volume seller” doctrine in calculating damages in this case.

Y. Punitive Damages

ABG contends the master erred in awarding punitive damages because there was no evidence its actions were willful, intentional, or with reckless disregard of Collins’ rights. ABG further contends the amount of punitive damages violated the Due Process Clause of the Fourteenth Amendment. We find no error.

*152A.

“The purposes of punitive damages are to punish the wrongdoer and deter the wrongdoer and others from engaging in similar reckless, willful, wanton, or malicious conduct in the future.”16 “Punitive damages also serve to vindicate a private right of the injured party by requiring the wrongdoer to pay money to the injured party.”17

South Carolina Code section 15-33-135 provides that “[i]n any civil action where punitive damages are claimed, the plaintiff has the burden of proving such damages by clear and convincing evidence.”18 Nevertheless, the trial court has considerable discretion regarding the amount of damages, both actual or punitive.19

In Gamble v. Stevenson, the supreme court mandated the following procedure for appellate review of an punitive damages award:

[T]o ensure that a punitive damage award is proper, the trial court shall conduct a post-trial review and may consider the following: (1) defendant’s degree of culpability; (2) duration of the conduct; (3) defendant’s awareness or concealment; (4) the existence of similar past conduct; (5) likelihood the award will deter the defendant or others from like conduct; (6) whether the award is reasonably related to the harm likely to result from such conduct; (7) defendant’s ability to pay; and finally, (8) ... “other factors” deemed appropriate.20

The master based his conclusions on his findings that the actions taken by ABG demonstrated ABG’s culpability, awareness of the contract and ultimate concealment of its desire to *153have Collins’ contract breached, the harm that was caused, the deterrent effect of a punitive damages award, and ABG’s ability to pay.

We hold there was evidence that ABG’s conduct was willful, intentional, and in disregard of Collins’ rights. Evidence was presented at trial of ABG’s intention to run T.A. Coats out of business if he did not agree to its request to purchase his business. ABG was made aware of the agreement between Collins and T.A. Coats, but nevertheless set up the purchase of the Ponderosa and Shipwatch locations in an attempt to avoid having to comply with the provisions of the lease.

As the master noted, ABG was “aware of the fact that Collins would suffer a serious economic loss if its contract was cancelled and Collins’ machines were removed.” Aso, ABG gained from procuring the breach of the contract because it would not have to share the revenues with Collins, but could instead install machines from another source and retain 100 per cent of the profits.

On appeal, ABG focuses on the fact the video poker industry no longer exists and, therefore, there is no opportunity for recidivism. Athough the video poker gaming industry is no longer legal in South Carolina, the conduct could nevertheless be continued in other industries. Furthermore, the possibility of future conduct is only one of several factors to consider. Given the egregious conduct by ABG and its total disregard for Collins’ rights, we uphold the master’s decision to award punitive damages.

B.

ABG also maintains the amount awarded is excessive and violates the Due Process Clause of the Fourteenth Amendment of the United States Constitution. Athough the punitive damages award greatly exceeded Collins’ actual damages, we hold the award does not violate due process.

“Punitive damages may properly be imposed to further a State’s legitimate interests in punishing unlawful *154conduct and deterring its repetition.”21 “Only when an award can fairly be categorized as ‘grossly excessive’ in relation to these interests does it enter the zone of arbitrariness that violates the Due Process Clause of the Fourteenth Amendment.” 22

As noted by the Supreme Court, “unlimited jury discretion — or unlimited judicial discretion for that matter — in the fixing of punitive damages may invite extreme results that jar one’s constitutional sensibilities.”23 Nevertheless, as one commentator has recently noted, “[generally, attorneys should be cautioned against relying on the ratio of punitive to compensatory damages to argue the constitutionality of awards. Although the ratio is a factor universally argued, there is no consistent pattern in its application.”24

In BMW of North America v. Gore, the Supreme Court provided the following factors for determining the reasonableness of a punitive damages award: (1) the degree of reprehensibility, (2) the ratio of the punitive damages award to the actual harm inflicted on the plaintiff, and (8) the comparison of the punitive damages award and the civil or criminal penalties that could be imposed for comparable misconduct.25

“Perhaps the most important indicium of the reasonableness of a punitive damages award is the degree of reprehensibility of the defendant’s conduct.”26 In the present case, ABG’s conduct was clearly wrongful, calculated, and improper. ABG intentionally interfered with a contract, and this interference inured to the detriment of one of the parties to the *155contract. Although ABG argues Collins suffered only economic harm, the degree of reprehensibility was still significant. ABG went to great lengths to ensure that it would get out from under the Collins agreement, be able to place its own machines at the Ponderosa and Shipwatch locations, and then be entitled to indemnification if anything went awry. Moreover, in addition to the unusual indemnification provision in the purchase and sale agreement, there was also evidence that ABG further attempted to insulate itself from liability by creating a shell corporation with no assets in case “the deal went sour.”

The second factor is the ratio of punitive to actual damages. ABG contends a ratio of 10 to 1 is excessive. We disagree. In his order, the master stated the award was “in part based upon [his] firm conviction that American Bingo and others must not be allowed to profit from misconduct of the type established in this case.” Given this reasoning and the ample authority to support it, we hold there was no due process violation.27

Y. Motion to Supplement

ABG contends the master erred in failing to allow it to supplement the record with additional testimony regarding its financial condition and more recent financial statements. The record, however, does not indicate that ABG made a proffer of either the contents of the financial records or the testimony or otherwise attempted to include this matter in the record on appeal. This court has no basis for determining *156whether the records and testimony at issue would have been beneficial to ABG. Consequently, this issue has not been preserved for review.28

AFFIRMED.