find b only using flat 25% tax rate.

09.02-PR011 WP A tractor for over-the-road hauling is to be purchased by AgriGrow for $90,000. It is expected to be of use to the company for 6 years, after which it will be salvaged for $4,000. Trans- portation cost savings are expected to be $170,000 per year; however, the cost of drivers is expected to be $70,000 per year and operating expenses are expected to be $63,000 per year, including fuel, main- tenance, insurance and the like. The company's income tax rate is 25% and MARR is 10% on after-tax cash flows. Suppose that, to AgriGrow's surprise, they actually dispose of the tractor at the end of the 4th tax year for $6,000. Develop tables using a spreadsheet to determine the ATCF for each year and the after-tax PW, AW, IRR, and ERR after only 4 years. a. Use straight-line depreciation (no half-year convention). b. Use MACRS-GDS and state the appropriate property class. c. Use double declining balance depreciation (no half-year convention, no switching). 09.02-PR011 WP A tractor for over-the-road hauling is to be purchased by AgriGrow for $90,000. It is expected to be of use to the company for 6 years, after which it will be salvaged for $4,000. Trans- portation cost savings are expected to be $170,000 per year; however, the cost of drivers is expected to be $70,000 per year and operating expenses are expected to be $63,000 per year, including fuel, main- tenance, insurance and the like. The company's income tax rate is 25% and MARR is 10% on after-tax cash flows. Suppose that, to AgriGrow's surprise, they actually dispose of the tractor at the end of the 4th tax year for $6,000. Develop tables using a spreadsheet to determine the ATCF for each year and the after-tax PW, AW, IRR, and ERR after only 4 years. a. Use straight-line depreciation (no half-year convention). b. Use MACRS-GDS and state the appropriate property class. c. Use double declining balance depreciation (no half-year convention, no switching)