Customers arrive at a public restaurant at the rate of 25 per hour. The restaurant has a single entrance, due to current COVID-19 situation all the customers should be scanned to enter to the dinning area. Customers are scanned once at a time according to the first come first served algorithm. A constant 80 seconds are required to scan each customer. Compute the following:

1. Percent of time the scanning machine is busy?
2. Average number of customers waiting in line to be scanned?
3. Average number of customers in the system?