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(Compound annuity) What is the accumulated sum of each of the following streams of payments? a. $480 a year for 10 years compounded annually at 10 percent. b. $112 a year for 6 years compounded annually at 9 percent. c. \$34 a year for 11 years compounded annually at 11 percent. d. $25 a year for 5 years compounded annually at 4 percent. a. What is the accumulated sum of $480 a year for 10 years compounded annually at 10 percent? (Round to the nearest cent.) b. What is the accumulated sum of $112 a year for 6 years compounded annually at 9 percent? (Round to the nearest cent.) c. What is the accumulated sum of $34 a year for 11 years compounded annually at 11 percent? (Round to the nearest cent.) d. What is the accumulated sum of $25 a year for 5 years compounded annually at 4 percent? (Round to the nearest cent.)