Calculating Interest Rates Solve for the unknown interest rate in each of the following: 3 Present Value Years Interest Rate Future Value $ 345 927 152,184 538,600 $242 410 51,700 18,750 16 27 Calculating the Number of Periods of the following: 4 Solve for the unknown number of years in each Present Value Years Interest Rate Future Value $ 625 810 6,500 21,500 7% 12 17 $ 1,284 4,341 402,662 47,350