Required: a. Assume that only one product is being sold in each of the four following case situations: b. Assume that more than one product is being sold in each of the four following case situations: Answer is not complete. Complete this question by entering your answers in the tabs below. Required A Required B Assume that only one product is being sold in each of the four following case situations: (Loss amounts should be indicated by a minus sign.) Unit sold: Sales Variable expenses Fixed expenses Net operating income (loss) Contribution margin per unit Case #1 8,500 $ 280,500 153,000 88,000 Case #2 (14,100) $ 380,700. Case #3 Case #4 20,900 4,900 $ 501,600 $ 142,100 211,500 209,000 78,400 55 39,500 $ 171,000 (1,800) $ 215,600 80,000 $ (16,300) 15 $ 12 S 14 S 13