For a recent year, McDonald's (MCD) company-owned restaurants had the following sales and expenses (in millions): Sales Food and paper Payroll and employee benefits Occupancy and other expenses $21,000 $(2,500) (2,300) (4,400) General, selling, and administrative expenses (4,800) $(14,000) Operating income $7,000 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? million 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 $1,000 million for the coming year, with no change in the contribution margin ratio or fixed costs? Round your answer to the nearest tenth of a million (one decimal place). million