Assume a merchandising company uses the high-low method to separate any mixed costs into their variable and fixed elements. It provided the following income statements: May June July Sales in units 4,800 5,000 5,500 Sales $ 168,000 $ 175,000 $ 192,500 Cost of goods sold 86,400 90,000 99,000 Gross margin 81,600 85,000 93,500 Selling and administrative expenses: Advertising 17,000 17,000 17,000 Shipping 16,800 17,500 19,250 Salaries and commissions 29,600 30,000 31,000 Total selling and administrative expenses 63,400 64,500 67,250 Net operating income $ 18,200 $ 20,500 $ 26,250 What is the estimated net operating income if the company sells 5,240 units