steps answer for question 13,and 15

13. NPV versus IRR [LO1, 5] Consider the following two mutually exclusive projects: Sketch the NPV profiles for X and Y over a range of discount rates from zero to 25 percent. What is the crossover rate for these two projects? 14. Problems with IRR [LO5] Light Sweet Petroleum, Inc., is trying to evaluate a generation project with the following cash flows: a. If the company requires a 12 percent return on its investments, should it accept this project? Why? b. Compute the IRR for this project. How many IRRs are there? Using the IRR decision rule, should the company accept the project? What's going on here? 15. Calculating Profitability Index [LO7] What is the profitability index for the following set of cash flows if the relevant discount rate is 10 percent? What if the discount rate is 15 percent? If it is 22 percent