Hudson's Helpers provides locksmith services. One type of service call is to evaluate private residences for security concerns and make recommendations for a safely plan. Use the data below to determine the company's total contribution margin, contribution margin per service call, and contribution margin ratio when $220$ service calls are made in the month of June.

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Select the formula labels needed to compute the contribution margin. Then, complete the table to calculate the contribution margin per service call, then the company's total contribution margin.