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 15,900 10,600 6,360 $ 190,800 $ 106,000 $ 318,000 127,200 74,200 53,000 33,920 106,000 $ $ 8,480 $ 10 $ 12,720 $ (10,600) 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 $ 506,000 $ 406,000 $ Variable expenses 263,900 606,000 424,200 Fixed expenses 101,500 131,800 Operating income (loss) $ 7,300 $ 21,800 $ (5,000) Average contribution margin (percentage) 20% 60%