Contribution margin and contribution marain 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, an administrative expenses. a. What is McDonald's contribution margin? millon b. What is McDonald's contribution maroin ratio? Round to one decimal place. c. How much would operating income increase if same-store sales increased by $900 million for the coming year, with no change in the contribution marain ratio or llxed cists? Round your answer to the nearest tenth of a million (one decimal place)