If Clerk Cost Is $30 Per Hour and Customer Waiting

Multiple Choice

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.
Customers filter into a record shop at an average of 1 per minute (exponential interarrivals) where the service rate is 15 per hour (exponential service times) .