Fill in the missing amounts in each of the eight case situations below. Each case is independent of the others. (Hint: One way to find the missing amounts would be to prepare a contribution format income statement for each case, enter the known data, and then compute the missing items.) 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: Units sold Sales Variable expenses Fixed expenses Net operating income (loss) Contribution margin per unit Case 1 Case 2 Case 3 Case 4 15,000 10,000 6,000 $ 180,000 $ 100,000 $ 300,000 120,000 70,000 50,000 32,000 100,000 $ 8,000 $ 12,000 $ (10,000) $ 10 $ 13