1. A grocery store operates 10 checkout counters. Sometimes at a counter there is a question that needs to be resolved by a roaming manager. When a question arises, a signal is sent to the managers' station and the checkout counter waits (and does not continue to process customers) until the question is resolved. The questions arise about once every 30 minutes at each counter, with the times between questions being exponentially distributed. It takes a roaming manager an average of 2 minutes to resolve a question and return the counter to service and these times are exponentially distributed as well. A roaming manager makes $35 per hour. It is estimated that time that a checkout counter spends not processing customers is worth $65 per hour. The grocery store currently has one roaming manager but is thinking about adding a second. Should they