You are given the following information for Smashville, Inc. Cost of goods sold: Investment income: Net sales: Operating expense: Interest expense: Dividends: Tax rate: $175,000 $2,800 $ 237,000 $ 42,000 $ 7,400 $10,000 21% Current liabilities: Cash: Long-term debt: Other assets: Fixed assets: Other liabilities: Investments: Operating assets: $18,000 $21,000 $10,000 $36,000 $89,000 $5,000 $12,000 $24,000 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.) % % Gross margin Operating margin Return on assets Return on equity % %