Compound annuity) What is the accumulated sum of each of the following streams of payments? a. $490 a year for 8 years compounded annually at 9 percent. . $108 a year for 6 years compounded annually at 8 percent. c. \$37 a year for 12 years compounded annually at 11 percent. d. \$21 a year for 6 years compounded annually at 6 percent. a. What is the accumulated sum of $490 a year for 8 years compounded annually at 9 percent? (Round to the nearest cent.)