Please fill in the blanks can I send me the explanation as well.

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 #1 Case #2 Case #3 Case #4 Unit sold 18,300 12,200 7,320 Sales $ 219,600 $ 122,000 $ 366,000 Variable expenses 146,400 85 400 Fixed expenses 61,000 39,040 122,000 Operating income (loss) 9,760 $ 14 640 9 $ (12,200 Contribution margin per unit 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 Sales Case #4 $ 522,000 $ 422,000 Variable expenses $ 622.000 274.300 Fixed expenses 435,400 105,500 136 600 Operating income (loss $ 8,100 Average contribution margin (percentage $ 26.600 $ 5000) 20% 60%