Fill in the missing amounts in each ofthe 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 19,200 $ 230,400 _ 12800 7,680 $ 128,000_ $ 384,000 Sales Variable expenses 153,600 _ 89 600 64,000 40,960 128,000 _ s s meow _ $ Fixed expenses Operating income (loss) m 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.) __ __ s 8400__ $ (4,000) Average contribution margin (percentage) 20% __ Variable expenses Fixed expenses Operating income (loss)