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 following four case situations: Unit sold Sales Variable expenses Fixed expenses 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 $ 69 $ 8,000 $ 10 $ 12,000 $ (10,000) 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 #2 Case #3 Case #4 Sales Variable expenses $ 500,000 $ 400,000 $ 600,000 260,000 420,000 Fixed expenses 100,000 130,000 Operating income (loss) $ 7,000 $ 20,000 $ (5,000) Average Contribution margin (percentage) 20% 60%