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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 (For all requirements, Loss amounts should be indicated by a minus sign.) Complete this question by entering your answers in the tabs below. Required A Required B Assume that more than one product is being sold in each of the four following case situations: Case #1 Case #2 Case #3 Case #4 Sales 447.000 S 200,000 S 306.000 Variable expenses 122,000 97.920 Fixed expenses 58,000 466,000 Net operating income (loss) 5 50,390 114,440 S (17.920) Contribution margin ratio (percent) 37 % 84 % o