You are given the following information for Smashville, Inc. Cost of goods sold: $ 259,000 Investment income: $ 3,100 Net sales: $ 402,000 Operating expense: $ 94,000 Interest expense: $ 7,400 Dividends: $ 11,000 Tax rate: 30 % Current liabilities: $ 20,000 Cash: $ 21,000 Long-term debt: $ 7,000 Other assets: $ 39,000 Fixed assets: $ 134,000 Other liabilities: $ 5,000 Investments: $ 15,000 Operating assets: $ 26,000 Calculate the gross margin, the operating margin, return on assets, and return on equity