Answer:
The firm's contribution margin ratio is 62.5%
Step-by-step explanation:
Contribution margin is the net of selling price and variable cost. It is the net return available to cover the fixed cost and make profit. Contribution margin ratio is the ratio of contribution margin to sale price.
According to given data
Price = $6
Variable cost = $2.25
Contribution margin = Price - variable cost = $6 - $2.25 = $3.75
Contribution margin ratio = 3.75 / 6 = 0.625 = 62.5%