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Calculate the future value of $9,000 in a" Four years at an interest rate of 10% per year. b, Eight years at an interest rate of 10% per year. C. Four years at an interest rate of 20% per year. d. Why is the amount of interest earned in part (a) less than half the amount of interest eamed in part (b)? a, Four years at an interest rate of 10% per year. Thefturo value of $9,000 in 4 years at an interest rate of 10% per year is S (Round to the nearest dollar) b, Eight years at an interest rate of 10% per year. Thefuture value of $9,000 in 8 years at an interest rate of 10% per year issl (Round tote nearest dollar.) C. Four years at an interest rate of 20% per year. The Sture value of S9.000 in 4 years at an interest rate of 20% per year is SL (Round t the nearest dollar) d. Why is the amount of interest earned in part (a) less than half the amount of interest earned in part (b)? (Select the best choice below.) O A. The amount of interest eamed in part (a) is really half of the amount of interest earmed in part (b) since in part (b) the money grows for twice as many years as O B This results because you earn interest on past interest. Since more interest has been paid at the end of the time period than at the be in in the money grows in part (a) faster C. The interest earned in part (a) is based on a lower effective annual interest rate O D. The annual interest rate in part (b) is slightly higher than the rate assumed in part (a). This is because of compounding