(Compound interest) To what amount will the following investments accumulate? a. $5,000 invested for 10 years at 10 percent compounded annually. b. $8,000 invested for 7 years at 8 percent compounded annually. c. $775 invested for 12 years at 12 percent compounded annually. d. $21,000 invested for 5 years at 5 percent compounded annually. a. To what amount will $5,000 invested for 10 years at 10 percent compounded annually accumulate? $ (Round to the nearest cent.) b. To what amount will $8,000 invested for 7 years at 8 percent compounded annually accumulate? $ (Round to the nearest cent.) c. To what amount will $775 invested for 12 years at 12 percent compounded annually accumulate? $ (Round to the nearest cent.) d. To what amount will $21,000 invested for 5 years at 5 percent compounded annually accumulate? $1 (Round to the nearest cent.)