Problem 2)

The AON network for the project is provided, along with information on the normal time, crash time, normal cost, and crash cost, as well as the earliest start time (ES), earliest finish time (EF), latest start time (LS), latest finish time (LF), and slack time for each activity.

Activity	Immediate predecessors	Normal time (days)	Crash time (days)	Normal cost	Crash cost	Crash cost per day
A	-	2	2	400	-	-
B	A	7	7	800	-	-
C	A	5	2	600	900	100
D	A	4	1	1600	2200	200
E	C, D	4	1	500	1700	400
F	B, E	2	2	1300	-	-

Activity	ES	EF	LS	LF	Slack time
A	0	2	0	2	0
B	2	9	4	11	2
C	2	7	2	7	0
D	2	6	3	7	1
E	7	11	7	11	0
F	11	13	11	13	0

Use this information to complete this question: Crash the above project to the maximum days it can be crashed at the least cost. For each stage (day) that the project is crashed, fill out the following table. If more rows are needed, please add them manually.

Stage	Critical path/s	Total project time before crashing	Crash activity/ies	Crash cost added	Total crash cost of the project	Total project time after crashing
1
2
3

What happens to the slack time of activity B if the duration of activity C reduced by 2 days? Explain your answer.