Question 15 Not yet answered Marked out of 1.00 Flag question Roy services (Oil Change) vehicles in his garage. His lubricants cost him $40 per vehicle. His wages are $120 per hour. He spends 20 minutes per vehicle. His garage rent is $600 per month. He charges $140 to service each vehicle. His Contribution Ratio in servicing each vehicle is 43% a. b. 86% C 120% d. Not possible to calculate Select one: a Not possible to calculate O b. 86% O c. 43% O d. 120%