The Central Valley Company is a manufacturing firm that produces and sells a single product. The companys revenues and expenses for the last four months are given below. Central Valley Company Comparative Income Statement March April May June Sales in units 5,600 5,100 6,150 7,200 Sales revenue $ 728,000 $ 663,000 $ 799,500 $ 936,000 Less: Cost of goods sold 386,900 358,020 415,740 477,360 Gross margin $ 341,100 $ 304,980 $ 383,760 $ 458,640 Less: Operating expenses Shipping expense $ 62,700 $ 54,800 $ 66,200 $ 68,000 Advertising expense 79,000 79,000 79,000 79,000 Salaries and commissions 162,600 140,000 164,500 177,500 Insurance expense 12,000 12,000 12,000 12,000 Amortization expense 45,000 45,000 45,000 45,000 Total operating expenses $ 361,300 $ 330,800 $ 366,700 $ 381,500 Net income $ (20,200 ) $ (25,820 ) $ 17,060 $ 77,140