An assembly line is to be designed to operate 7½ hours per day and supply a steady demand of 300 units per day. Here are

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An assembly line is to be designed to operate 7½ hours per
day and supply a steady demand of 300 units per day. Here are the
tasks and their performance times: TASK PRECEDING TASKS PERFORMANCE
TIME (SECONDS) TASK PRECEDING TASKS PERFORMANCE TIME (SECONDS) A —
70 G D 60 B — 40 H E 50 C — 45 I F 15 D A 10 J G 25 E B 30 K H, I
20 F C 20 L J, K 25 a. Draw the precedence diagram. b. What is the
workstation cycle time required to produce 300 units per day? c.
What is the theoretical minimum number of workstations? d. Assign
tasks to workstations using the longest operating time. e. What is
the efficiency of your line balance, assuming it is running at the
cycle time from part (b)? f. Suppose demand increases by 10
percent. How would you react to this? Assume that you can operate
only 7½ hours per day.