s).  Marty has been offered an injury settlement of ​$15 comma 000 payable in 5 years. He wants to know what the present value of the injury settlement is if his opportunity cost is 3.5 ​%. ​ (The opportunity cost is the interest rate in this​ problem.) What if the opportunity cost is 7.5 ​%? What if it is 11.5 ​%?