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 paper, payroll, 25\% of occupancy and other expenses, and 40% of the general, selling, and administrative expenses. a. What is McDonald's contribution margin? x milison b. What is McDonald's contribution margin ratio? Round to one decimal place. c. How much would operating income increase if same-store sales increased by $800 million for the coming year, with no change in the contribution margin ratio or foxed costs? Round your answer to the nearest tenth of a milion (one decimal place) million