(Compound annuity) What is the accumulated sum of each of the following streams of payments? a. $480 a year for 9 years compounded annually at 10 percent. b. $96 a year for 8 years compounded annually at 7 percent. c. $32 a year for 13 years compounded annually at 12 percent. d. $21 a year for 5 years compounded annually at 5 percent. a. What is the accumulated sum of $480 a year for 9 years compounded annually at 10 percent? g (Round to the nearest cent.) b. What is the accumulated sum of $96 a year for 8 years compounded annually at 7 percent