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 Caso #2 Caso #3 Case #4 15,300 10,200 6,120 $ 183,600 $ 102,000 $ 306,000 122,400 71,400 51,000 32,640 102,000 $ 8,160 $ 12,240 $ (10,200) $ 10 $ 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.) Sales Variable expenses Case #1 $ 502,000 $ Case #2 Case #3 Case #4 402,000 $ 602,000 261,300 421,400 Fixed expenses Operating income (loss) 100,500 130,600 7,100 $ 20,600 $ (4,800) Average contribution margin (percentage) 20% 60%