You are evaluating two different aluminum milling machines. The Alumina I costs $240,000, has a three-year life, and has pretax operating costs of $63,000 per year. The Alumina II costs $420,000, has a five-year life, and has pretax operating costs of $36,000 per year. For both milling machines, use straight-line depreciation to zero over the project's life and assume a salvage value of $40,000. If your tax rate is 35 percent and your discount rate is 10 percent, which do you prefer? Why?

Answer this question using Microsoft Excel. Mark the key equations and write them out.