For the following set of cash flows, Year 0 1 WN - Cash Flow -$9,000 3,700 5,500 5,500 a. What is the NPV at a discount rate of O percent? b. What is the NPV at a discount rate of 15 percent? c. What is the NPV at a discount rate of 24 percent? d. What is the NPV at a discount rate of 29 percent