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

Sales$21,300Food and packaging$7,844Payroll5,400Occupancy (rent, depreciation, etc.)4,316General, selling, and administrative expenses3,100$20,660Income from operations$640

Assume that thevariable costsconsist 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.)

$million

b.What is McDonald's contribution margin ratio?

%

c.How much would income from operations increase if same-store sales increased by $1,300 million for the coming year, with no change in the contribution margin ratio orfixed costs? Round your answer to the closest million.

$million