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Assume that the variable costs consist of food and packaging. payroll, and 40% of the general, selling, and administrative expenses. a. What is MeDonald's contribution margin? Round to the nearest million. (Give answer in millions of dolliars.) milion b. What is Mcbosnald's contribution margin ratio? c. How much would operating income increase if same-store sales increased by $1,600 million for the coming vear, with no change in the contribution margin ratio or fixed costs? Round your answer to the closest million. million