Aconsulting engineering firm is trying to decide whether it should purchase ford explorers of 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 the explorer and 60% for the toyota. if the firm's marr is 18% per year, which make of vehicle should it buy?