Harry's Helpers provides locksmith services. One type of service call is to evaluate private residences for security concerns and make recommendations for a safety plan. Use the data below to determine the company's total contribution margin, contribution margin per service call, and contribution margin ratio when $80$ 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

$\backslash$table$[[,$Per call $80$ calls$],[$Service Revenue,$$,140],[$Variable Costs,,$84],[,,],[$Contribution Margin,$$,56]]$

Data table

$\backslash$table$[[$Service Revenue,$$140$ per service call$],[$Variable Costs,$84$ per service call$],[$Fixed Costs,$2,980$ per month$]]$