Hello! can anyone help me with C?

Thanks a lot!

You have 3 projects with the following cash flows: 1 2 Year Project 1 Project 2 Project 3 0 -$151 -825 21 $21 0 $41 0 61 3 $59 6,994 78 4 $80 -6,490 - 247 42 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 for project 1 is 10 %. (Round to the nearest integer.) The IRR for project 2 is 10 %. (Round to the nearest integer.) The IRR for project 3 is 10 %. (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.)