Answer:Total contribution margin = $240,000---c
Step-by-step explanation:
Contribution margin is the revenue left after removing the variable costs that are incurred in producing a product. This margin helps one to know how profitability each item is that a company produces and puts up for sale.
It is calculated as
Contribution per unit = selling price per unit - variable costs per unit.
$12-$6 = $6
Total contribution margin = Contribution per unit x number of units sold.
$6 x 40,000 units
= $240,000