Contribution margin and contribution margin ratio For a recent year, McDonald's (MCD) company-owned restaurants had the following sales and expenses (in millions): a. What is McDonald's contribution margin? $ million b. What is McDonald's contribution margin ratio? Round to one decimal place. % c. How much would operating income increase if same-store sales increased by $800 million for the coming year, with no change in the contribution margin costs? Round your answer to the nearest tenth of a million (one decimal place). $ million