(Compound interest) To what amount will the following investments accumulate? a. $5,200 invested for 8 years at 10 percent compounded annually. b. $7,800 invested for 6 years at 7 percent compounded annually. c. $750 invested for 13 years at 11 percent compounded annually. d. $20,000 invested for 5 years at 6 percent compounded annually. a. To what amount will $5,200 invested for 8 years at 10 percent compounded annually accumulate? (Round to the nearest cent.)