please help!

P9-11 Calculating NPV (LO1] For the following set of cash flows, Year 0 1 2 3 Cash Flow -$ 9,100 3,100 3,400 4,600 a. What is the NPV at a discount rate of 0 percent? NPV b. What is the NPV at a discount rate of 13 percent? NPV c. What is the NPV at a discount rate of 22 percent? NPV d. What is the NPV at a discount rate of 27 percent? NPV