Problem 4-4 Calculating Interest Rates Solve for the unknown interest rate in each of the following (Do not round intermediate calculations and enter your answers as a percent rounded to 2 decimal places, e.g. 32.16.): Interest Rate Present Value $ 280 400 43.000 42,261 Years 5 19 % Future Value $ 372 1,370 238.809 20 30 f107,073 References eBook & Resources Worksheet Difficulty 1 Basic Problem 4-4 Calculating Interest Rates Section: 4.1 Valuation, The One-Period Case