Achemical plant stores spare parts for maintenance in a large warehouse. throughout the working day, maintenance personnel go to the warehouse to pick up supplies needed for their jobs. the warehouse receives a request for supplies, on average, every three minutes. the average request requires 2.75 minutes to fill a request. maintenance employees are paid $21.50 per hour and warehouse employees are paid $16 per hour. the warehouse operates 8 hours per day. a) based on the number of maintenance employees in the system, an 8 hour work day, and the given arrival and service rates. what is the system cost per day (to the nearest $) if there is only 1 warehouse employees working? b) based on the number of maintenance employees in the system, an 8 hour work day, and the given arrival and service rates. what is the system cost per day (to the nearest $) if there are 2 warehouse employees working? c) based on the number of maintenance employees in the system, an 8 hour work day, and the given arrival and service rates. what is the system cost per day (to the nearest $) if there are 3 warehouse employees working? d) what is the optimal number of warehouse employees to staff the warehouse?