Given that, an operator is assigned to operate some CNC machines. The machine running time is m = 3 minutes, job loading/unloading time is l = 1 minutes. The operator needs w = 0.25 minutes to walk from machine to machine. The operator is paid k1 = $82 per hour, and the machine cost is approximately k2 = $50 per hour. Calculate the expected cost (TEC) per minute when the operator runs 3 machines.