Barry's Tire Service completed 100 tire changes, 10 brake jobs, and 15 alignments in an eight-hour 2. day with his standard crew of six mechanics. A brake specialist costs $20 per hour, a tire changer costs $10 per hour, and an alignment mechanic costs $12 per hour. The materials cost for a day was $2500, and overhead cost was $500 What is the shop's labor productivity if the retail price for tire change, brake job and alignment . service is $60, $150, and $50, respectively? b. What is the multifactor productivity, if the crew consisted of two of each type mechanic