You have 3 projects with the following cash flows: (Click on the following icon in order to copy its contents into a spreadsheet.) Year 0 1 2 3 4 Project 1 - $148 $21 $38 $61 $79 Project 2 0 0 6,992 - 6,509 - 824 18 Project 3 40 58 81 - 243 a. For which of these projects is the IRR rule reliable? b. Estimate the IRR for each project (to the nearest 1%). c. What is the NPV of each project if the cost of capital is 5%? 20%? 50%