Discussion
Four jobs are on order in a factory. As on day 20 of the production calendar, the corresponding due date and work remaining to complete these jobs (in days) are given in the table below.
| Job | Due date | Work remaining (in days) |
| M | 26 | 5 |
| N | 24 | 10 |
| O | 28 | 10 |
| P | 31 | 5 |
Which job(s) has/have critical ratio less than unity?
Answer: A
The jobs with critical ratio below one are Job N and Job O.
Critical ratio = (time remaining until due date) / (work remaining). On day 20:
\[ \begin{aligned} M &: (26 - 20)/5 = 1.2 \\ N &: (24 - 20)/10 = 0.4 \\ O &: (28 - 20)/10 = 0.8 \\ P &: (31 - 20)/5 = 2.2 \end{aligned} \]
A ratio below 1 means the job is behind schedule. Only N and O qualify. M and P are ahead of schedule, so the options containing them are wrong.
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