During the Early Morning Hours, Customers Arrive at a Branch

question 12

Multiple Choice

During the early morning hours, customers arrive at a branch post office at the average rate of 45 per hour (exponential interarrival times) , while clerks can handle transactions on an average of 4 minutes each (exponential) .
If clerk cost is $30 per hour and customer waiting time represents a cost of $20 per hour, how many clerks can be justified on a cost basis?

• A) 2.
• B) 3.
• C) 4.
• D) 5.
• E) 6.

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