The manager of a car wash must decide whether to have one or two wash lines. One line will mean a fixed cost of $\$ 5,600$ a month. and two lines will mean a fixed cost of $\$ 8,960$ a month. Each line would be able to process 15 cars an hour. Variable costs will be $\$ 3$ per car, and revenue will be $\$ 5.95$ per car. The manager projects an average demand of between 14 and 18 cars an hour. Would you recommend one or two lines? The car wash is open 290 hours a month. Choose $\operatorname{line}$

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