Final answer:
The contribution margin ratio is calculated by dividing the contribution margin ($299,250) by sales revenue ($525,000) and multiplying by 100%, which equals b. 57%.
Step-by-step explanation:
To calculate the contribution margin ratio, divide the contribution margin by the sales revenue. The contribution margin is already provided in the income statement as $299,250. The sales revenue is $525,000. The formula for the contribution margin ratio is:
Contribution Margin Ratio = (Contribution Margin / Sales Revenue) × 100%
By plugging in the provided numbers, we get:
Contribution Margin Ratio = ($299,250 / $525,000) × 100%
Contribution Margin Ratio = 0.57 or 57%
Therefore, the correct answer is: