50. McDonald's Corporation sells three types of meals: Big Mac Meals, Chicken McNugget Meals, and Filet-O-Fish Meals. The selling price, variable cost per unit, and contribution margin per unit for each meal are as follows:

Meal	Selling Price per Unit ($)	Variable Cost per Unit ($)	Contribution Margin per Unit ($)
Big Mac Meal	$5	$3
Chicken McNugget Meal	$4	$2
Filet-O-Fish Meal	$4.50	$2.50

Calculate the missing contribution margin per unit for each meal.