You have been offered a unique investment opportunity. If you invest $ 15000 today, you will receive $750 one year from now, $2,250 two years from now, and $15,000 ten years from now. a. What is the NPV of the investment opportunity if the interest rate is 6% per year? Should you take the opportunity? b. What is the NPV of the investment opportunity if the interest rate is 2% per year? Should you take the opportunity? How is discount rate factored? How is PV(C(t) calculated? Please show all work in excel format