CNBC reported that one in five consumers who purchase bitcoin do so using their credit card. Melissa Gamez purchased a used RV with 19,800 miles for $47,700. Originally the RV sold for $74,000 with a residual value of $20,800. After subtracting the residual value, depreciation allowance per mile was $0.94. How much was Melissas purchase price over or below the book value? Note: Input the amount as positive value