For the following set of cash flows, a. What is the NPV at a discount rate of 0 percent? b. What is the NPV at a discount rate of 9 percent? c. What is the NPV at a discount rate of 22 percent? b. What is the NPV at a discount rate of 9 percent? c. What is the NPV at a discount rte of 22 percent? d. What is the NPV at a discount rate of 27 percent