For a recent year, mcdonald's company-owned restaurants had the following sales and expenses (in millions): sales $18,169.3 food and packaging $ 6,129.7 payroll 4,756.0 occupancy (rent, depreciation, etc.) 4,402.6 general, selling, and administrative expenses 2,487.9 $17,776.2 income from operations $ 393.1 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 tenth of a million (one decimal place). $ 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 $500 million for the coming year, with no change in the contribution margin ratio or fixed costs? round your answer to the nearest tenth of a million (one decimal place).