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?

Select one:

a. 40

b. 50

c. 100

d. 30

e. 60

f. 67.5

g. None of the provided options

0.2 0.4 0.2 1.2 a 0.4 1.0 2.0 d g