In a Starbucks store a cashier taken an average of 5 minutes to handle a request. The salary of the cashiers is $6 per hour and average of 10 customers per hour visit the store. The customer lose $10/hour waiting in the system. The store is investigating two alternatives to improve their system. Your job is to evaluate these options and select the best alternative. c. Add a helper with the cost of $4 per hour which improve the service time to 4 minutes (instead of 5 minutes) d. Or change the current system to an M/M/2 system. Adding a new station equipment (not including the staffing cost) will cost the store $1000/year. (assume 365 days/year, and 8 working hours/day)
