(Compound annuity) What is the accumulated sum of each of the following streams of payments? a. $500 a year for 9 years compounded annually at 10 percent b. $100 a year for 7 years compounded annually at 9 percent c. 531 a year for 13 years compounded annually at 12percent d. $28 a year for 5 years compounded annually at 5 percent a. What is the accumulated sum of $500 a year for 9 years compounded annually at 10 percent? $(Round to the nearest cent) b. What is the accumulated sum of $100 a year for 7 years compounded annually at 9 percent? (Round to the nearest cent) c. What is the accumulated sum of $31 a year for 13 years compounded annually at 12percent? (Round to the nearest cent) d. What is the accumulated sum of 528 a year for 5 years compounded annually at 5 percent? $(Round to the nearest cent) Enter your answer in each of the answer boxes