For each of the six independent situations that follow, compute the missing amounts. a. Using contribution margin per unit: b. Using the contribution margin ratio: Complete this question by entering your answers in the tabs below. Required A Required B Using the contribution margin ratio: Sales Variable Costs Contribution Margin Ratio (%) Fixed Costs Operating Income (1) $900,000 $ 720,000 % $ 95,000 (2) 600,000 (3) 40 % 75,000 30 % 90,000 60,000 < Required A Required B >