Problem 5-21 (similar to) (Compound annuity) What is the accumulated sum of each of the following streams of payments? a. $510 a year for 8 years compounded annually at 10 percent. b. $104 a year for 8 years compounded annually at 9 percent. c. $32 a year for 13 years compounded annually at 13percent. d. $24 a year for 6 years compounded annually at 6 percent. a. What is the accumulated sum of $510 a year for 8 years compounded annually at 10 percent? (Round to the nearest cent.)