(a) (17 points) The International Jumbo Corporation is considering purchasing personal computers. It can either buy Apple PC's or Lenovo PC's. The Apple PC costs $1,200 and is expected to last for five years. Annual maintenance costs are $200 per year paid at year's end. The machines are expected to have no salvage value. The Lenovo PC costs $1,800 and is expected to last six years and has annual maintenance costs of $250. It is expected to have a salvage value of $300. The firm estimates its workload is such that it should either buy 400 Apple PC's or 300 Lenovo PC's. There is expected to be no technological progress. International Jumbo uses straight line depreciation. Both maintenance costs and depreciation are tax-deductible. The firm's tax rate is 40%. Its discount rate for this type of investment is 8 percent. Should the firm buy Apple PCs or Lenovo PCs