Fill in the missing amounts in each of the eight case situations below. Each case is independent of the others. (Hint: One way to nd 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: 3. Assume that only one product is being sold in each of the following four case situations: Unit sold 17,700 212,400 Sales Variable expenses Fixed expenses Operating income (loss) Contribution margin per unit 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 $ 518,000__ $ 618,000 $ $ (4.000) _ Variable expenses Fixed expenses Operating income (loss) Average contribution margin (percentage) 20%