Check my work Required: a. Assume that only one product is being sold in each of the following four case situations: 1.33 Case #1 Case #2 Case #3 Case #4 points Unit sold 15,000 4,000 10,000 6,000 Sales $ 180,000 $ 100,000 $ 200,000 300,000 eBook Variable expenses 120,000 60,000 70,000 210,000 References Fixed expenses 50,00 32,000 118,000 100,000 Operating income (loss) $ 10,000 $ 8,000 $ 12,000 $ (10,000 Contribution margin per unit $ $ 10 $ 13 $ 15 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 $ 500,000 $ 400,000 $ 600,000 Variable expenses 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% Mc Graw Hill