Final answer:
The contribution margin ratio is 33.3%.
Step-by-step explanation:
The contribution margin ratio is calculated by dividing the contribution margin by the selling price. The formula for contribution margin is:
Contribution margin = Selling price - Variable cost per unit
In this case, the selling price is $300 and the variable cost per unit is $200. Therefore, the contribution margin per unit is $100.
The contribution margin ratio can be calculated by dividing the contribution margin per unit by the selling price per unit and multiplying by 100. So:
Contribution margin ratio = (Contribution margin per unit / Selling price per unit) x 100
Plugging in the values, we get:
Contribution margin ratio = ($100 / $300) x 100 = 33.3%
Therefore, the answer is option d. 33.3%.