please break it down so I can understand this

For a recent year, Mcdonald's Company-owned restaurants had the following sales and expenses (in millions): Sales $26,500 Food and packaging $8,435 Payroll 6,700 Occupancy (rent, depreciation, etc.) 6,675 General, selling, and administrative expenses 3,900 $25,710 Income from operations $790 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 $1,600 million for the coming year, with no change in the contribution margin ratio or fixed costs? Round your answer to the closest million. million