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 21,000 5,100 $ 261,000 $ 275,100 $ 158,100 126,000 189,000 Contribution margin Fixed expenses 80,000 178,000 75,000 Net operating income (loss) $ (86,300) $ 213,000 $ 6,600 Contribution margin per unit $ 7 $ 14