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 19,500 Case #2 Case #3 Case #4 13,000 7,800 $ 234,000 $ 130,000 $ 390,000 156,000 91,000 65,000 41,600 130.000 S $ 10,400 $ 10 $ 15,600 $ 13 (13,000) 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.) Operaung income (rss) Contribution margin per unit $ 10,400 10 $ 13,000 (13) 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 03 Case #4 Sales s 530,000 $ 430,000 $ 630,000 Variable expenses 279,500 441,000 Fixed expenses 107,500 139,000 Operating income (loss) $ 8,500 $ 29,000 $ (5,000) Average contribution margin (percentage) 20% 60%