A consulting engineering firm is trying to decide whether it should purchase Ford Explorers or Toyota 4Runners for company principals. The models under consideration would cost $29,000 for the Ford and $32,000 for the Toyota. The annual operating cost of the Explorer is expected to be $200 per year less than that of the 4Runner. The trade-in values after 3 years are estimated to be 50% of first cost for Explorer and 60% for the Toyota. (a) What is the rate of return relative to that of Ford, if Toyota is selected? (b) If the firm's MARR is 18% per year, which make of the vehicle should it buy?