PROBLEM NO. 4 Machine X has an initial cost of $10,000, annual maintenance of $500 per year, and no salvage value at the end of its four-year useful life. Machine Y costs $20,000. The first year there is no maintenance cost. The second year, maintenance is $100, and increases $100 per year in subsequent years. The machine has an anticipated $5,000 salvage value at the end of its 12-year useful life. If interest is 8%, which machine should be selected? The analysis period is not selected in the problem. Therefore, select the least common multiple of the lives, or 12 years, as the analysis period.