a. Beginning one month from now, one of the airport concessionaires will pay the airport his facility rent fee of $25 per month for the next five years. Assuming all revenue for a year is received at the middle of a year, estimate the NPV of these revenues. Use interest rate =0.15 b. Assuming all revenue for a month is received at the beginning of the month, use the XNPV function to obtain the exact NPV of these revenues in part (a) above. Use interest rate =0.15 2) Consider a project having the following cash flows below and answer the following questions in "Problem 2 " sheet: a. Try to find the IRR of this project without simply guessing. What problem arises? b. What is the IRR of this project? Does the project have a unique IRR