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 indicat a minus sign.) Case 1 Case 2 Case 3 Case 4 Units sold 9,900 19,400 4,600 Sales Variable expenses $ 277,200 $ 406,000 $ 142,600 138,600 155,200 Contribution margin 138,600 196,000 64,400 Fixed expenses 94,000 180,000 81,000 Net operating income (loss) $ 44,600 $ 16,000 $ 214,000 $ (16,600) Contribution margin per unit $ 14 S 15