During the early morning hours, customers arrive at a branch post office at an average rate of 20 per hour (Poisson), wh

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During the early morning hours, customers arrive at a branch
post office at an average rate of 20 per hour (Poisson), while
clerks can handle transactions in an average time (exponential) of
2 minutes each. Assume one clerk in the system. If clerk cost is
$30 per hour and customer waiting time represents a "cost" of $20
per hour. Compute the total hourly cost for this system. Select
one: a. 110 b. 150 c. 70 d. 32