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 20,700 13,800 8,280 $ 248,400 $ 138,000 $ 414,000 165,600 96,600 69,000 44,160 138,000 $ 11,040 $ 16,560 $ (13,800) $ 10 $ 13