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 four following case situations Case #1 Case #2 Case #4 Case #3 9,100 5,100 Unit sold 20,800 Sales $ 309,400$ 367,200 $137,700 Variable expenses 163,800 228,800 75,000 Fixed expenses 83,000 166,000 Net operating income (loss) $78,800161,600 (29,100) 18 $ Contribution margin per unit 12 b. Assume that more than one product is being sold in each of the four following case situations: Case #1 Case #2 Case #4 Case #3 Sales $456,000$ 207,000 $304,000 79,040 Variable expenses 140,760 Fixed expenses 54,000 468,000 $65,520 (3,040) Net operating income (loss) 85,640 44% 76% Contribution margin ratio (percenf)