4. (40%) You have two office-block proposals. You initially intended to invest $300,000 in the building and then sell it at the end of the year for $400,000. Under the revised proposal, you planned to rent out the offices for 3 years at a fixed annual rent of $20,000 and then sell the building for $400,000. a). Calculate the IRR for the initial proposal; b). Calculate the IRR for the revised proposal; c). Which proposal should be chosen based on the IRRs of the proposals? d). Calculate the crossover rate of initial and revised proposals; e). Suppose that you use NPV rule to rank these two proposals. Which proposal should be chosen if the appropriate discount rate is 5%? f). Explain why you have same (different) selection(s) in question c) and d)