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\%? The IRR rule is reliable for Unless all of the cash flows of the project precede the ones, the IRR rule may give the wrong answer and should not be used. Furthermore, there may be multiple IRRs or the IRR may not exist. b. Estimate the IRR for each project (to the nearest 1\%). The IRR for project 1 is \%. (Round to the nearest integer.) The IRR for project 2 is \%. (Round to the nearest integer.) The IRR for project 3 is %. (Round to the nearest integer.) c. What is the NPV of each project if the cost of capital is 5%?20%?50% ? The NPV for project 1 for a cost of capital of 5% is $ (Round to the nearest cent.)