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 19,800 13,200 7,920 $ 237,600 $ 132,000 $ 396,000 158,400 92,400 66,000 42,240 132,000 $ $ 10,560 $ 10 $ 15,840 $ 13 (13,200) 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 $ 532,000 $ 432,000 $ Variable expenses 280,800 632,000 442,400 Fixed expenses 108,000 139,600 Operating income (loss) $ 8,600 $ 29,600 $ (4,000) Average contribution margin (percentage) 20% 60%