b. Assume that more than one product is being sold in each of the four following case situations: Case #4 $ 290,000 Case #1 Case #2 Case #3 Sales Variable expenses Fixed expenses Net operating income (loss) Average contribution margin ratio (percent) $ 459,000$ 209,000 135,850 51,000 78,300 469,000 $ 90,960 44% $ 66,800$(11,300) 76%