If you insulate your office for $22,000, you will save $2,200 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 NPV 5% 10% b. What is the IRR of the investment? (Enter your answer as a whole percent.) IiAIR c. What is the payback period on this investment? Payback period years