Fill in the blanks for each of the following independent cases. P.: (Click the icon to view the cases.) ..... (For entries with a $0 balance, make sure to enter "O" in the appropriate cell. Round the contribution margin percentage to the nearest whole percent.) Variable Fixed Total Operating Contribution Case Revenues Costs Costs Costs Income Margin Percentage a. $ 200 $ 500 $ 1,800 % b. $ 2.100 $ 300 $ 400 % C. $ 1,100 $ 800 $ 1,100 % d. $ 1,800 $ 300 50 % Data table Variable Costs Fixed Costs Total Costs Operating Income Contribution Margin Percentage Case Revenues Case a. $ 200 $ 500 $ 1,800 Case b. $ 2,100 $ 300 $ 400 Case c. $ 1,100 $ 800 $ 1,100 Case d. $ 1,800 $ 300 50%