The maintenance department of an Oil and Gas Company has 6 large drilling equipment waiting for repairs. These are labelled A, B, C, D, E and F. The respective repair times (in days) and the remaining days before the due date are given in the table below.

Equipment	Time required	Due (at the end of) day
A	1	30
B	8	27
C	3	38
D	27	57
E	2	29
F	29	42

[15 Marks]

2. What will be the job sequences using (1) CR and (2) SPT rules?
4. What will be the (1) average flow time, (2) average days late, and 3) average work in progress for the CR and SPT sequences?
6. Apply the appropriate method to determine the sequence which will minimize the total number of late jobs.