Find the interest rate implied by the following combinations of present and future values: (Do not round intermediate calculations. Enter your answers as a percent rounded to 2 decimal places. Leave no cells blank - be certain to enter "0" wherever required.) Years Present Value $420 193 320 10 Future Value 826 257 320 Interest Rate 6.00% 9.06% 01% 3 6 Compute the future value of a $140 cash flow for the following combinations of rates and times. (Do not round intermediate calculations. Round your answers to 2 decimal places.) a. r=8%; t = 10 years Future value $ 399.40 -48 b. r= 8%; t 20 years Future value S 862.28 c. r= 4%; t= 10 years Future value $ 273.85