ABC company has a machines in a local office. The mean arrival rate is 20 users per hour. The service times are exponentially distributed, with a mean service rate using 2 minutes for one customer. What is the utilitization rate of the equipment? Find the expected number of users in the waiting line Find the expected number of users in the system What is the cost per 8-hour day for detaining persons to use the machine if the average user's time is estimated to be worth $20 per hour