Income Statements For the Three Months Ended September 30 July Sales in units 4,000 4,500 5,000 Sales $400,000 240,000 $450,000 270,000 $500,000 300,000 Cost of goods sold Gross margin Selling and administrative expenses: 160,000 80,000 200,000 Advertising expense Shipping expense Salaries and commissions Insurance expense Depreciation expense 21,000 34,000 78,000 6,000 15,000 21,000 36,000 84,000 6,000 21,000 38,000 90,000 6,000 15,000 15,000 162,000 $ 6.000 S 18,000 Total selling and administrative expenses 154,000 170,000 Net operating income 30,000 Required 1. identify each of the company's expenises (including cost of goods sold) as elther variable, fixed, or mixed Classification Variable Fixed Mixed Mixed Fixed Expenses Cost of goods sold Advertising expense Shipping expense Salaries and commissions Insurance expense Depreciation expense 5 P3