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 should be indicated by a minus sign.) Case #1 Case #2 Case #3 Case #4 Unit sold 8,600 19,400 4,600 Sales $ 379,900 $ 128,800 252,200 157,200 222,700 Variable expenses Contribution margin Fixed expenses Net operating income (loss) Contribution margin per unit 240,800 $ 129,000 111,800 98,000 13,800 $ 13 $ 79,000 $ 176,000 46,700 $ 17 $ (33,000) 126,400 $ 11 $