Contribution Margin and Contribution Margin Ratio

For a recent year, McDonald's company-owned restaurants had the following sales and expenses (in millions):

c. How much would income from operations increase if same-store sales increased by $811 million for the coming year, with no change in the contribution margin ratio or fixed costs? Round your answer to the closest million.

I got 517.34 and it is wrong....help!!

For a recent year, McDonald's company-owned restaurants had the following sales and expenses (in millions): $16,233 Sales Food and packaging 5,300 Payroll 4,121 3,638 Occupancy (rent, depreciation, etc) General, selling, and administrative expenses 2,334 $15,393 840 Income from operations 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 5878 million b. What is McDonald's contribution margin ratio? Round to one decimal place. 36.2 c. How much would income from operations increase if same-store sales increased by $811 million for the coming year, with no change in the contribution margin ratio or fixed costs Round your answer to the closest million. million