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: 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 s a minus sign.) Case #1 Case #12 Case #3 Case #4 Unit sold 8,600 19,100 5,800 Sales $ 266,600 $ 274,000 $ 156,600 Variable expenses 154,800 191,000 Fixed expenses 94,000 172,000 74,000 Net operating income (loss) $ (62,400) $ 148,200 $ (21,800) Contribution margin per unit $ 13 $ 8 $ 12 < Required A Required B >