4. (15 points) An investment of $900 is needed for a project today. Sales of $1,100 year can be produced forever. The first year's costs are $600, and after that they rise by 20% annually. (Assume all the sales and costs occur at year's end; in this case, expenses are $600 at time t = 1). Anytime and without penalty, the project can be terminated. Ignore taxes and calculate the NPV of the project at a 12 percent discount rate.

6. (15 points) At time zero (t = 0), a project requires a $90,000 initial investment in equipment and a $10,000 initial investment in working capital. You anticipate that the project will generate revenues of $120,000 per year for three years. You predict that manufacturing expenses will account for 60% of revenues. Assume that all income and expenses (i.e., t = 1, t = 2, and t = 3) occur at year's end. Over the three-year period, the equipment depreciates utilizing straight-line depreciation. The company can sell the equipment for \$10,000 at the end of the project and recover its investment in net working capital. The cost of capital is 15%, and the corporation tax rate is 21%. Calculate the project's NPV.

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