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.) $ million b. What is McDonald's contribution margin ratio? % c. How much would income from operations increase if same-store sales increased by $1,100 million for the coming year, with no change in the contribution margin ratio or fixed costs? Round your answer to the closest million. $ million