Trosper tire company has decided to hire a new mechanic to handle all tire changes for customers ordering a new set of tires. two mechanics are available for the job. one mechanic has limited experience and can be hired for $7 per hour. it is expected that this mechanic can service an average of three customers per hour. a mechanic with several years of experience is also being considered for the job. this mechanic can service an average of four customers per hour, but must be paid $10 per hour. assume that customers arrive at the trosper garage at the rate of two per hour. a) compute waiting-line operating characteristics for each mechanic b) if the company assigns a customer waiting cost of $15 per hour, which mechanic provides the lower operating cost? note: this is the cost of customer waiting in the system.