Answer:
Bill and Ted's contribution margin for the first month is $790
Explanation:
Contribution margin per unit is the amount that each additional unit sold contributes towards a company’s fixed costs and profit and calculated by following formula:
Contribution Margin per Unit = Sales Price – Variable Cost per Unit
The company had 10 service calls each earning $99 revenue per call and variable costs amounting to $20 per call
Contribution Margin per Unit = $99 - $20 = $79
Bill and Ted's contribution margin for the first month = $79 x 10 = $790