Don't give me publisher's answer please

E11-10 Contribution margin and contribution margin ratio For a recent year, McDonald's company-owned restaurants had the following sales and ex- penses (in millions): Sales Food and packaging Payroll Occupancy (rent, depreciation, etc.) General, selling, and administrative expenses Other expense (income) $27,006 6,167 4,606 4,064 2,394 1,245 18,476 530 Income from operations Assume that the variable costs consist of food and packaging, payroll, and 80% of the general, selling, and administrative expenses. a. What is McDonald's contribution margin? Round to the nearest million. b. What is McDonald's contribution margin ratio? Round to one decimal place. c. How much would income from operations increase if same-store sales increased by $800 million for the coming year, with no change in the contribution margin ratio or fixed costs