Problem 8-26 Investment Criteria (L01, LO2, L04) If you insulate your office for $12,000, you will save $1,200 a year in heating expenses. These savings will last forever. a. What is the NPV of the investment when the cost of capital is 5%? 10%? Cost of Capital 5% NPV 10% b. What is the IRR of the investment? (Enter your answer as a whole percent.) IRR % c. What is the payback period on this investment? Payback period years