Contribution Margin and Contribution Margin Ratio For a recent year, McDonald's (MCD) company-owned restaurants had the following sales and expenses (in millions): Assume that the variable costs consist of food and packaging, payroll, and 40% of the general, selling, and administrative expenses. a. What is McDonald's contribution margin? Round to the nearest million. (Give answer in millions of dollars.) $ X million b. What is McDonald's contribution margin ratio? X% c. How much would operating income increase if same-store sales increased by $2,300 million for the coming year, with no change in the contribution margin ratio or fixed costs? Round your answer to the closest million. $ x million