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 20,100 13,400 8,040 $ 241,200 $ 134,000 $ 402,000 160,800 93,800 67,000 42,880 134,000 $ 10,720 $ $ 10 $ 16,080 $ 13 (13,400) 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.) Sales $ Case #1 534,000 Case #2 $434,000 Case #3 Case #4 $ Variable expenses 282,100 634,000 443,800 Fixed expenses 108,500 140,200 Operating income (loss) $ 8,700 $ 30,200 $ (4,000) Average contribution margin (percentage) 20% 60%