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 following four case situations: Case #3 15.000 Case #4 10,000 S 280,000 Case #1 Case #2 15.000 S 150,000 $ 120,000 90.000 57,000 28,000 s 28,000 s 20 Unit sold Sales Variable expenses Fixed expenses Operating income (loss) Contribution margin per unit 60,000 150.000 (20,000) S 125,000 $ S 15 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.) Case #3 Case #4 Case #1 S 400.000 Sales $ 600,000 Case #2 S 480.000 302,400 145.000 Variable expenses 480,000 Fixed expenses Operating income (loss) Average contribution margin (percentage) 140,000 20,000 S 6.000 S S (4200) 25% 64%