It takes an operator 1.30 minute to service a machine and 0.1 minute to walk to the next machine. Each machine runs automatically for 2 minutes, the operator earns $11.00/hour and the machines cost $15.00/hour to run. After calculating n1 and n2, How many machines can the operator service based in the lowest TEC? A. 3 B. 4 C. 2 D. 6 E. 7 Two operators are assigned to service four machines that have an expected downtime of 50 percent. When running, each machine can produce 60 units/hour. The operator is paid $30.00/hour, and a machine costs $60.00/hour to run. How much is total expected cost (TEC) per piece for two operators? A. $2.00 B. $1.64 C. $1.38 D. $1.77 E. $1.01 An operator is assigned to service four machines that have an expected downtime of 10 percent. When running, each machine can produce 50 units/hour. The operator is paid $20.00/hour, and a machine costs $70.00/hour to run. How much is total expected cost (TEC) per piece for one operator? A. $0.95 B. $1.15 C. $1.69 D. $1.52 E. $2.14