Response to the following problem:
Customers arrive at Burger Barn on the average of once every 72 seconds. The average time to serve a customer is 1.5 minutes. Employees earn $12 per hour in wages and benefits, and the goodwill cost of a customer being in the system is estimated to be $25 per hour. For the next two weeks Burger Barn is planning a special promotion that it believes will double the customer arrival rate.
Management wishes to determine the optimal number of employees to have working in the store during this two-week time period.