The Temple Toy Company has decided to manufacture a new toy tractor, the production of which is broken into six steps. The demand for the tractor is 4800 units per 40-hour workweek: TASK A B C D E F PERFORMANCE TIME (SEC) 20 30 15 15 10 30 PREDECESSORS None A A A B, C D, E a) Draw a precedence diagram of this operation. b) Given the demand, what is the cycle time for this operation? c) What is the theoretical minimum number of workstations? d) Assign tasks to workstations. e) How much total idle time is present each cycle? f) What is the overall efficiency of the assembly line with five stations; and with six stations?