15. The following precedence network is used for assembling a product. You have been asked to achieve an output of 240 units per eight-hour day. All times in this network are in minutes. Balance the line using the following rule: assign tasks to workstations on the basis of most following tasks (Rule 1). Use greatest positional weight (Rule 2) as a tiebreaker. What is the utilization (%) of the worker in the workstation 1? 0.2 0.4 02 1.2 a b 0.4 1.0 2.0 g 30 67.5 None of the provided options 60 40 50 100