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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 $ 516,000 $ 416,000 $ 616,000 Variable expenses 103,200 270,400 431,200 Fixed expenses 405,000 104,000 134,800 180,200 Operating income (loss) $ 7,800 $ 41,600 $ 24,800 $ (4,600) Average contribution margin (percentage) 20% 35% 60% 30%