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Fill in the missing amounts in each of the eight case situations below. Each case is independent of the others. (Hint: One way to nd 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: Unit sold 8,300 _ 19,800 4,800 $ 144,000 Sales 207,500 Variable expenses 132,800 Fixed expenses 81,000 165,000 _ 84,000 NetOperating income (loss) $ (31,800) $ 132,800 $ (21,600) Contribution margin per unit $ 9 $ 11 b. Assume that more than one product is being sold in each of the four following case situations: Variable expenses _ 141 450 _ 87 870 Net operating Income (loss) _$ 91 000 (19,870) Average contribution margin ratio (percent) __$_