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 18,300 12,200 7,320 $ 219,600 $ 122,000 $ 366,000 146,400 85,400 61,000 39,040 122,000 $ $ 9,760 $ 10 $ 14,640 $ 13 (12,200) 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 Sales $ 522,000 Case #2 $422,000 Case #3 Case #4 $ Variable expenses 274,300 622,000 435,400 Fixed expenses 105,500 136,600 Operating income (loss) $ 8,100 $ 26,600 $ (5,000) Average contribution margin (percentage) 20% 60%