“The burden of proof is more rigorous with respect to the fact of damage than to the amount of damage. A plaintiff must show to a reasonable degree of certainty that some damage occurred, while a relaxed burden of proof [applies] to ascertainment of the amount of damage.” Slip-N-Slide Records, Inc. v. TVT Records, LLC, No. 05-21113-CIV, 2007 WL 3232274, at *10 (S.D. Fla. Oct. 31, 2007) (quoting Alphamed Pharm. Corp. v. Arriva Pharm., 432 F. Supp. 2d 1319, 1342 (S.D. Fla. 2006))(emphasis in original); Christopher Adver. Grp., Inc. v. R & B Holding Co. Inc., 883 So. 2d 867, 871 (Fla. 3d DCA 2004) (law does not contemplate that damages must be calculated with mathematical exactness); G.M. Brod & Co., Inc. v. U.S. Home Corp., 759 F.2d 1526, 1538 (11th Cir.1985) (proof of damages may be indirect and based upon assumptions and estimates, as long as the assumptions rest on adequate data).