a. For which of these projects is the IRR nulo relabie? b. Ettmaie the IRR for each project (to the nearest 1\%) c. What is the NPV of each project if the cost of captal is 5%?20%7 50\%? a. For which of these projects is the IRR nie reliable? (Select trom the drop-down manus.) The IRR rule is relable for Uniess ali of the cash flaws of the prciect precede the anes, the iRR nule may give the wrong answer and should not b used Futhermore, there may be mulipie IRRs or the IRR may not eniat