Given the following information on job times and due dates.

Job Job Time (Hours) Due Date (Hours)
a 3.5 7
b 2.0 6
c 4.5 18
d 5.0 22
e 2.5 4
f 6.0 20

Determine the optimal processing sequence using:

a. First come, first served
b. Shortest processing time
c. Earliest due date.
d. Critical ratio.

Job sequence

First come first serve = a - b-c-d-e-f

Shortest processing time = b-e-a-c-d-f

Earliest due date = e-b-a-c-f-d

Critical ratio = e-a-b-f-c-d

First come first serve Shortest processing time Earliest due date Critical ratio

Average flow time 12.5 11.33 11.58 12.08

Avg Job tardiness 2.83 0.83 0.42 0.67

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