Fill in the missing amounts in each of the eight case situations below. Each case is independent of the others. 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.) Units sold Sales Variable expenses Case 1 Case 2 Case 3 Case 4 9,000 19,300 4,800 $ 270,000 $ 321,600 $ 153,600 126,000 231,600 Contribution margin Fixed expenses 88,000 177,000 74,000 Net operating income (loss) $ (43,000) $ 68,400 $ (16,400) Contribution margin per unit $ 10 $