(Compound annuity) What is the accumulated sum of each of the following streams of payments? a. $510 a year for 9 years compounded annually at 9 percent b. $96 a year for 8 years compounded annually at 8 percent. C. $32 a year for 12 years compounded annually at 12 percent d. $25 a year for 6 years compounded annually at 6 percent $ 6,640.73 (Round to the nearest cent) b. What is the accumulated sum of $96 a year for 8 years compounded annually at 8 percent