RANKINGS Nicholson Roofing Materials Inc. is considering two mutually exclusive projects that both cost $150,000. The company's board of directors has set a maximum four-year payback requirement, the cost of capital is 9%. The project cash flows appear below. a. Calculate the payback period for each project. b. Calculate the NPV of each project at 0%. c. Calculate the NPV of each project at 9%. d. Derive the IRR of each project. e. Rank the projects by each of the techniques used. Make and justify a recommendation. f. Go back one more time and calculate the NPV of each project using a cost of capital of 12%. Does the ranking of the two projects change compared to your answer in part e? Why