The Central Valley Company is a manufacturing firm that produces and sells a single product. The company's revenues and expenses for the last four months are given below. Sales in units Sales revenue Less: Cost of goods sold Gross margin Less: Operating expenses Shipping expense Advertising expense Salaries and commissions Insurance expense Amortization expense Total operating expenses Net income Central Valley Company Comparative Income Statement March 5,300 April 4,800 May 5,700. $769,500 454,410 $ 436,590 $ 69,500 74,500 179,000 $ 715,500 378,950 $ 648,000 June 6,600 $ 891,000 $ 336,550 349,920 $298,080 400, 140 $ 369,360 $ 65,600 74,500 74,500 141,500 163,000 10,500 10,500 43,500 $325,400 43,500 $357,100 $ 62,100 $ 55,400 74,500 161,700 10,500 43,500 $ 352,300 10,500 43,500 $377,000 $ (15,750) $ (27,320) $ 12,260 $ 59,590 Required: 1. Management is concerned about the losses experienced during the spring and would like to know more about the cost behaviour. Develop a cost equation for each of the costs. (Do not round intermediate calculations. Round "Per Unit" answers to 2 decimal places.) Cost of goods sold Shipping Salaries & commission +1+1 per unit per unit per unit