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: Case #2 Case #3 Case #4 7,680 Unit sold 12,800 Case #1 19,200 $ 230,400 153,600 64,000 $ 128,000 $ 384,000 Sales Variable expenses Fixed expenses Operating income (loss) Contribution margin per unit 89,600 40,960 10,240 $ 10 $ 128,000 (12,800) $ 15,360 $ $ 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 $ 528,000 $ 428,000 $ 628.000 278,200 439,600 107,000 138,400 Variable expenses Fixed expenses Operating income (loss) Average contribution margin (percentage) $ 8,400 $ 28,400 $ (4,000) 20% 60%