Question: (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