A company is considering the purchase of a new machine for $48,000. Management predicts that the machine can produce sales of $16,000 each year for the next 10 years. Expenses are expected to include direct materials, direct labor, and factory overhead totaling $8,000 per year plus depreciation of $4,000 per year. The company's after-tax net income, based on a tax rate of 40%, is $2,400. What is the approximate accounting rate of return for the machine?