Final answer:
The contribution margin ratio is 18%. The ratio is calculated by dividing the contribution margin by the sales revenue.
Step-by-step explanation:
The contribution margin ratio is calculated by dividing the contribution margin by the sales revenue. The contribution margin is the difference between the sales revenue and the variable costs. In this case, the direct materials and direct labor, other variable costs, and fixed costs are considered as total variable costs. So the contribution margin can be calculated as:
Contribution Margin = Sales Revenue - Total Variable Costs
Contribution Margin = $1,000,000 - ($500,000 + $50,000 + $270,000)
Contribution Margin = $1,000,000 - $820,000
Contribution Margin = $180,000
The contribution margin ratio is then:
Contribution Margin Ratio = (Contribution Margin / Sales Revenue) * 100
Contribution Margin Ratio = ($180,000 / $1,000,000) * 100
Contribution Margin Ratio = 18%
Therefore, the correct answer is not provided in the options. The contribution margin ratio for Boswell's company is 18%.