Harper's Helpers provides locksmith services. One type of service call is to evaluate private residences for security concerms 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. EEB (Click the icon to view the data.) 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 80 calls Data Table Contribution Margin Select the formula to calculate the contribution margin ratio Contribution Margin Ratio The contribution margin ratio is %. Service Revenue120 per service call Variable Costs Fixed Costs 12 per service call 7.140 per month Print Done