MTI must supply 350,000 phones annually, with routine shipments throughout the year. The company operates eight hours a day and 6 days a week for 220 days a year. Due to employee stoppages, maintenance and other reasons, it has been estimated that 60 minutes in each eight-hour work day is not productive. All necessary tasks, predecessor tasks, and estimated task times for manufacturing a phone have been identified.

Answer the following with the entire procedure: a) Draw the precedence relationship diagram indicating the workstations b) Calculate the cycle time in minutes, the minimum number of stations required, the idle time and the efficiency of the line c) Using a table, demonstrate the correct assignment of each of the activities to each station, step by step.

TASK DESCRIPTION PRECEDENT TIME (min) A Inspect the set of parts to see that it is complete Ninguna 0.26 B Attach two hoods to the hood assembly A 0.04 C Place your feet on the base A 0.22 D Test the base circuits A 0.06 E Secure the keyboard module to the keyboard assembly A 0.08 F Install the volume control knob in the house assembly B 0.16 G Rivet base circuits to base C, D 0.01 H Attach the hood assembly to the base using screws F. G 0.13 I Press keys into keyboard module E 0.07 J Attach hanging buttons and their spring to the ceiling mount I 0.08 K Rivet the keyboard assembly to the base H, J 0.08 L Connect the wires between the circuits, keypad module and hood assembly K 0.02 M Insert the cable through the earphone A 0.18 N Connect and insert the headset module into it M 0.02 Connect and insert the microphone module into the headset N 0.08 P Test the finished unit 0.01 Q Pack for shipment L. P 0.01