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Please help me. :-)

Your firm is considering purchasing a machine with the following annual, end-of-year, book investment accounts. Gross investment Less: Accumulated depreciation Net investment Purchase Date $71,000 Year 1 $71,000 Year 2 $71,000 Year 3 $71,000 Year 4 $71,000 71,000 17,758 35,58053,250 $71,000 $53,250 $35,500 $17,750 The machine generates, on average, $7,300 per year in additional net income What is the average accounting return for this machine? (Do not round intermediate calculations. Enter your answer as a percent rounded to 2 decimal places, e.g., 32.16.) AAR