Please answer all three parts : A, B, and C -> answer in the same form as asked for a quick thumbs up!

(this Question has been asked several times on Chegg but noone has answered it in the form that the question reqesrs.)

A manager wants to assign tasks to workstations as efficiently as possible, and achieve an hourly output of 4 units. The department uses a working time of 56 minutes per 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? (Round your answer to 2 decimal places.)