Answer:
A. 52% and $11 per unit
Explanation:
The contribution margin ratio is a measure of how much of a business revenue is available for covering its variable expenses. It also reveals how much is left to cover its fixed cost. The contribution margin is the unit income generated from each product sold. To calculate contribution margin ratio we divide contribution margin by sales. i.e
Contribution margin ratio = (contribution margin)/sales
Contribution margin = (sales - variable expenses)/sales
OR
contribution margin = (selling price - average variable cost)/ selling price
Since selling price is $21 and average variable cost is $10
contribution margin = (21 - 10)/21
= 11/21
=52.38% or 0.5238
Contribution margin = $21 - $10
= $11
thus, A. 52% and $11 per unit is the answer.
variable cost per unit also means average variable cost.