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7-45. A manufacturing process can be designed for varying degrees of automation. The following is relevant cost information: First Cost Annual Labor Expense Annual Power and Maintenance Expense Degree A $10,000 B. 14,000 20,000 D 30,000 $9,000 7,500 5,000 3,000 $500 800 1,000 1,500 Determine which is best by after-tax analysis using an income tax rate of 40%, an after-tax MARR of 15%, and SL depreciation. Assume that each has a life of five years and no BV or MV. (7.9) a