, compute the after-tax rate of return. The company uses a MARR of 7%. 3) Use the after-tax IRR method to evaluate the following three alternatives using MACRS depreciation for a 3-year property. The after-tax MARR is 25%, the project life is 5 years and the firm uses a flat tax rate of 45%. Alternative Salvage First Cost $14,000 $18,000 $10,000 Benefits $1,500 $1,000 $5,000 $5,000 $10,000 $O