Please explain your work and all the steps

Homework i Fill in the missing amounts in each of the eight case situations below. Each case is independent of the others. Required: a. Assume that only one product is being sold in each of the four following case situations: b. Assume that more than one product is being sold in each of the four following case situations: Complete this question by entering your answers in the tabs below. Required A Required B Assume that only one product is being sold in each of the four following case situations: (Loss amounts should be indicated by a minus sign.) Case #1 Case #2 Case #3 Case #4 Unit sold 8,600 19,500 4, 100 Sales $ 283,800 $ 399,600 $ 106,600 Variable expenses 111,800 156,000 Fixed expenses 82,000 163,000 73,000 Net operating income (loss) $ 88,600 $ 222,000 $ (36, 100) Contribution margin per unit $ 17 $ 16