Virginia is the productivity planner of Xerox Photocopier and she wants to determine the minimum number of balanced workstations required to maximize operations efficiency. There are 8 working hours per day and the demand is 39 units per day. There are nine tasks to be done per unit of photocopier. The time needed to finish task A is 10 minutes, B is 9 minutes, C is 5 minutes, D is 4 minutes, E is 10 minutes, F is 3 minutes, G is 5 minutes, H is 11 minutes, and I is 7 minutes. The predecessor/s of task B is A, C is B, D is B, E is A, F are C and D, G is F, H is E, and I are G and H.

1.How many workstations should be created based on most following or preceding tasks?

2.What is the efficiency per station?

3.What is the overall efficiency?