Compute the future values of (a) an initial $2,000 compounded annually for 10 years at 8 percent; (b) an initial $2,000 compounded annually for 10 years at 10 percent; (c) an annuity of $2,000 for 10 years at 8 percent; and (d ) an annuity of $2,000 for 10 years at 10 percent.