You are determining whether your company should undertake a new project and have calculated the NPV of the project using the WACC method when the CFO, a former accountant, notices that you did not use the interest payments in calculating the cash flows of the project. What should you tell him? If he insists that you include the interest payments in calculating the cash flows, what method can you use? The former accountant also tells you to assume the opportunity cost of the company’s idle asset is zero. Is he correct?

Why / why not?