(Compound annuity) What is the accumulated sum of each of the following streams of payments? a. $490 a year for 9 years compounded annually at 10 percent. b. $112 a year for 7 years compounded annually at 8 percent. c. $38 a year for 11 years compounded annually at 13 percent. d. $28 a year for 6 years compounded annually at 4 percent. a. What is the accumulated sum of $490 a year for 9 years compounded annually at 10 percent? $ (Round to the nearest cent.) b. What is the accumulated sum of $112 a year for 7 years compounded annually at 8 percent? $ (Round to the nearest cent.) c. What is the accumulated sum of $38 a year for 11 years compounded annually at 13 percent? $ (Round to the nearest cent.) d. What is the accumulated sum of $28 a year for 6 years compounded annually at 4 percent? $ (Round to the nearest cent.)