Tire Inc. recently reported $93,000 of total assets, $74,600 of common equity, $28,000 of sales, $13,100 of operating costs other than depreciation, and $2,500 of depreciation. The company has no amortization charges and no non-operating income. It had $8,200 of bonds outstanding that carry a 13% interest rate, its federal-plus-state income tax rate was 35%. What is Tire's return on assets?