The manager of a bank must determine how many tellers should work on Fridays. For every minute

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The manager of a bank must determine how many tellers should work on Fridays. For every minute a customer stands in line, the manager believes that a delay cost of 5¢ is incurred.

An average of 2 customers per minute arrive at the bank. On the average, it takes a teller 2 minutes to complete a customer’s transaction. It cost the bank $9 per hour to hire a teller. Interarrival times and service times are exponential. To minimize the sum of service costs and delay costs, how many tellers should the bank have working on Fridays?

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Asim farooq

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