Problem $6-2($Static$)$

A manager wants to assign tasks to workstations as efficiently as possible, and achieve an hourly output of ${33}^{\frac{1}{3}}$ 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?

Note: Round your answer to $2$ decimal places.