Required: a. Assume that only one product is being sold in each of the following four case situations: Case #1 Case #2 Case #3 Case #4 Unit sold 10,000 10,000 10,000 Sales $ 160,000 $ 100,000 $ 280,000 k Variable expenses 80,000 60,000 Fixed expenses 44,000 34,000 150,000 t Operating income (loss) $ 8,000 $ 30,000 $ (10,000) nces Contribution margin per unit $ 10 $ 13 b. Assume that more than one product is being sold in each of the following four case situations: (Enter "Contribution margin ratio" in percent. Round your final answers to the nearest whole dollar amount.) Case #1 Case #3 Case #4 Sales $ 400,000 Case #2 $ +0,000 252,000 $ 500,000 Variable expenses 360,000 Fixed expenses 105,000 100,000 6,600 $ 20,000 $ (4,200) Operating income (loss) Average contribution margin (percentage) 30% 60% 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