A manager wants to assign tasks to workstations as efficiently as possible and achieve an hourly output of 33⅓ units. Assume the shop works a 60-minute hour. Assign the tasks shown in the accompanying precedence diagram (times are in minutes) to workstations using the following rules:

a. In order of most following tasks. Tiebreaker: greatest positional weight.

b. In order of greatest positional weight. Tiebreaker: most following tasks.

c. What is the efficiency?