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 thecompany's total contribution margin, contribution margin per service call, and contribution margin ratio when 140 service calls are made in the month of June. 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. Per call 140 calls Contribution Margin Select the formula to calculate the contribution margin ratio Contribution margin ratio The contribution margin ratio is Table Data Service Revenue Variable cost Fixed cost 130 per service call 13 per service call 15,180 per month $