(Compound annuity) What is the accumulated sum of each of the following streams of payments?

a. $520 a year for 10 years compounded annually at 10 percent.

b. $112 a year for 8 years compounded annually at 8 percent.

c. $34 a year for 13 years compounded annually at 11 percent.

d. $28 a year for 4 years compounded annually at 5 percent.

a. What is the accumulated sum of $520 a year for 10 years compounded annually at 10 percent? $______ (Round to the nearest cent)