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: Unit sold Sales Variable expenses Fixed expenses Operating income (loss) Contribution margin per unit Case #1 Case #2 Case #3 Case #4 15.600 10,400 6,240 $ 187,200 $ 104,000 $ 312,000 124,800 72,800 52,000 33,280 104,000 $ $ 8,320 $ 12,480 $ (10,400) 10 $ 13 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 #1 Case #2 Case #3 Case #4 Sales Variable expenses Fixed expenses $ 504,000 $ 404,000 $ 262,600 604,000 422,800 101,000 131,200 Operating income (loss) $ 7,200 $ 21,200 $ (4,000) Average contribution margin (percentage) 20% 60%