currently, ACS has five service centers in HOUSTON and its suburbs. the largest service center is located in downtown HOUSTON, which is also the headquarters of the company. Mr. Smith is the head of the company. each repair center has a service manager, five to ten repair technicians, and one to two cashiers. the service center are open from 9:00 AM to 6:00 PM. Customers bring defective computer to the service center. the service manager at a center talks to the customer to find out his or her computer problems and estimates the cost for the repair. if the customer agrees with the cost, the manager will make a schedule for the customer to pick up the computer. at the time the customer picks up the repaired computer, the cashier at the service center will work with the customer to get the payment