The appellant having conceded that the trial court erred in ordering the husband to pay fifteen per cent interest on the unpaid installments of lump sum alimony, the final judgment of dissolution is modified to provide that the interest on such installments be six per cent, see § 687.01, Fla.Stat. (1981); in all other respects, the final judgment is affirmed. See Canakaris v. Canakaris, 382 So.2d 1197 (Fla. 1980); Bullard v. Bullard, 385 So.2d 1120 (Fla. 2d DCA 1980).