For a recent year, McDonald's Company-owned restaurants had the following sales and expenses (in millions): Sales $25,700 Food and packaging $8,982 Payroll 6,500 Occupancy (rent, depreciation, etc.) 5,748 General, selling, and administrative expenses 3,700 $24,930 Income from operations $770 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