8 An average of 300 customers per hour arrive at a huge branch of bank 2. It

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8 An average of 300 customers per hour arrive at a huge branch of bank 2. It takes an average of 2 minutes to serve each customer. It costs $10 per hour to keep open a teller window, and the bank estimates that it will lose $50 in future profits for each hour that a customer waits in line.

How many teller windows should bank 2 open?

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