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 16,500 11,000 6,600 $ 198,000 $ 110,000 $ 330,000 132,000 77,000 55,000 35,200 110,000 $ 8,800 $ 13,200 $ (11,000) $ 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 Sales $ 510,000 $ Case #2 410,000 Case #3 Case #4 $ 610,000 Variable expenses 266,500 427,000 Fixed expenses 102,500 133,000 Operating income (loss) $ 7,500 $ 23,000 $ (4,000) Average contribution margin (percentage) 20% 60%