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 18,600 12,400 7,440 $ 223,200 $ 124,000 $ 372,000 148,800 86,800 62,000 39,680 124,000 $ $ 9,920 $ 10 $ 14,880 $ (12,400) 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 $ 524,000 $ 424,000 $ 624,000 Variable expenses 275,600 436,800 Fixed expenses 106,000 137,200 Operating income (loss) $ 8,200 $ 27,200 $ (4,800) Average contribution margin (percentage) 20% 60%