For the following set of cash flows, Year 0 Cash Flow --$8,700 4,700 6,700 4,700 2 3 a. What is the NPV at a discount rate of O percent? b. What is the NPV at a discount rate of 13 percent? c. What is the NPV at a discount rate of 17 percent? d. What is the NPV at a discount rate of 22 percent