I need help in solving this question. I don't just want the answer but I want to know step by step solutions. Thank you so much.

The Patches Group has invested $40,000 in a high-tech project lasting three years. Depreciation is $13,700, $16,900, and $9,400 in Years 1, 2, and 3, respectively. The project generates pretax income of $4,370 each year. The pretax income already includes the depreciation expense. The tax rate is 40 percent. What is the projects average accounting return (AAR)? (Do not round intermediate calculations. Enter your answer as a percent rounded to 2 decimal places, e.g., 32.16.) AAR: