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

Sales

Food and paper

Payroll and employee benefits

Occupancy and other expenses

General, selling, and administrative expenses

Operating income

Assume that the variable costs consist of food and paper, payroll, $25\%$ of occupancy and other expenses, and $40\%$ of the general, selling, and administrative expenses.

a$.$ What is McDonald's contribution margin?

$

million

b$.$ What is McDonald's contribution margin ratio? Round to one decimal place.

$\%$

$($one decimal place$).$

$$,$ million