A Jiffy Lube location does 214 oil changes for ?$21 per 8 hour day with a staff of 5 and 3 stalls. If the staff pay rate is? $10/hour, stalls cost? $40/day and all other costs are? $20/day. If the multifactor productivity is closed to 10. About what percent of what Jiffy Lube produces is? goods/services?
a)90/10 b) 80/20 c) 20/80 d) 50/50