Under ideal? conditions, a service bay at a Fast Lube can serve 7 cars per hour. The effective capacity of a Fast Lube service bay is 5.5 cars per? hour, with efficiency known to be 0.85. The minimum number of service bays Fast Lube needs to achieve an anticipated production of 250 cars per 8?-hour day?.? service bays ?(enter your response rounded up to the next whole? number).