Present value $($with changing interest rates$).$ Marty has been offered an injury settlement of

$$14,000$ payable in $5$ years. He wants to know what the present value of the injury settlement is if his

opportunity cost is $4\mathrm{.}5\%.($The opportunity cost is the interest rate in this problem.$)$ What if the

opportunity cost is $6\%?$ What if it is $11\mathrm{.}5\%?$