Today is day 22 on the production control calendar, and four jobs are on order as shown :

Job Due Date Workday
Remaining

A 28 8

B 26 2

C 24 2

D 30 12

Rank the jobs as per critical ratio technique.

ABCD

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CDAB

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DACB

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CBAD

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Solution

The correct option is C DACB

Job Time
Remaining
(DD-DN) Work
Remaining
(LTR) Critical ratio
$C R = \frac{D D - D N}{L T R}$ Priority

A

B

C

D 28-22=6

26-22=4

24-22=2

30-22=8 8

2

2

12 0.75

2.00

1.00

0.67 2

4

3

1

With the critical ratio, jobs would be assigned in the order of D, A, C and B.

Jobs A and D have critical ratios of less than 1, meaning that the orders will not be shipped on time unless they are expedited. Job C, with an index of 1, is the only job, "on schedule".

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Job	Time Remaining (DD-DN)	Work Remaining (LTR)	Critical ratio $C R = \frac{D D - D N}{L T R}$	Priority
A B C D	28-22=6 26-22=4 24-22=2 30-22=8	8 2 2 12	0.75 2.00 1.00 0.67	2 4 3 1