Problem 8: A new municipal refuse collection vehicle can be purchased for $84,000. Its expected useful life is 6 years, at which time the market value and book value will be zero. Before-tax cash flow (BTCF) will be +$18,000 per year over the 6-year life of the vehicle. a. Use straight-line depreciation, an effective income tax rate of 40% and an after-tax MARR of 12% to determine the present worth of the investment. b. What is the after-tax internal rate of return? c. Is this vehicle a sound investment? Explain your