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. (Grve answer in millions of dollars.) milition b. What is McDonald's contribution margin ratio? % c. How much would operating income increase if same-store sales increased by $1,600 million for the coming year, with no change in the contribution margin retio or fixed costs? Round your answer to the closest million. million