(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. $100 a year for 7 years compounded annually at 8 percent. c. $36 a year for 11 years compounded annually at 11percent. d. $22 a year for 6 years compounded annually at 4 percent. a. What is the accumulated sum of $510 a year for 9 years compounded annually at 9 percent? (Round to the nearest cent.) b. What is the accumulated sum of $100 a year for 7 years compounded annually at 8 percent? (Round to the nearest cent.) c. What is the accumulated sum of $36 a year for 11 years compounded annually at 11 percent? (Round to the nearest cent.) d. What is the accumulated sum of $22 a year for 6 years compounded annually at 4 percent? (Round to the nearest cent.)