How much money can be withdrawn at the end of the investment period if: a. $1,000 is invested at 8%/year compounded annually for 10 years? b. $5,000 is invested at 11%/year compounded annually for 4 years? c. $13,000 is invested at 9%/year compounded annually for 7 years? d. $25,000 is invested at 10%/year compounded annually for 3 years