You are given the following information for Smashville, Inc. Cost of goods sold: $ 154,000 Investment income: $ 1,800 Net sales: $ 287,000 Operating expense: $ 38,000 Interest expense: $ 7,400 Dividends: $ 13,000 Tax rate: 35 % Current liabilities: $ 20,000 Cash: $ 21,000 Long-term debt: $ 30,000 Other assets: $ 42,000 Fixed assets: $ 123,000 Other liabilities: $ 5,000 Investments: $ 38,000 Operating assets: $ 35,000 Calculate the gross margin, the operating margin, return on assets, and return on equity. (Do not round intermediate calculations. Enter your answers as a percent rounded to 2 decimal places. Omit the "%" sign in your response.) Gross margin % Operating margin % Return on assets % Return on equity %