Activity Name |
Activity |
Normal Duration (days) |
Crash Duration (days) |
Normal Cost (Rs.) |
Crash Cost (Rs.) |
Cost Slope |
A |
10-20 |
2 |
2 |
1000 |
1000 |
0 |
B |
10-30 |
7 |
3 |
500 |
900 |
100 |
C |
20-30 |
6 |
3 |
300 |
420 |
40 |
D |
20-40 |
5 |
4 |
200 |
250 |
50 |
E |
30-40 |
0 |
0 |
0 |
0 |
0 |
F |
30-50 |
9 |
4 |
600 |
900 |
60 |
G |
40-60 |
11 |
6 |
600 |
1000 |
80 |
H |
50-60 |
6 |
3 |
700 |
910 |
70 |
Cost Slope=Crash Cost-Normal CostNormal Time-Crash Time
Stage 1 : - All Normal

Critical path = 10-20-30-50-60 i.e. A-C-F-H
Project duration = 23 days.
Stage 2 : - All Crash

Critical path :-
1) 10-20-30-50-60 (A-C-F-H)
2) 10-20-40-60 (A-D-G)
Project duration = 12 days
Stage 3 :- Stage 1 + Crash C by 1 day

Critical paths :- 10-20-30-50-60 (A-C-F-H)
10-30-50-60 (B-F-H)
Stage 4 :- Stage 3 + Crash F by 4 days

All critical
Duration = 18 days
Stage 5 : - Stage 4 + Crash F by 1 day & Crash G by 1 day

All critical
Project duration = 17 days
Stage |
Description |
Duration |
Direct Cost |
Indirect Cost |
Addition Crash Cost |
Total |
1 |
All Normal |
23 |
3900 |
80×23=1840 |
- |
5740 |
2 |
All Crash |
12 |
5830 |
80×12=960 |
- |
6340 |
3 |
Stage 1 + Crash C by 1 day |
22 |
3900 |
80×22=1760 |
1×40=40 |
5700 |
4 |
Stage 3 + Crash F by 4 days |
18 |
3900 |
80×18=1440 |
40+4×60=280 |
5620 |
5 |
Stage 4 + Crash,F by 1 day & Crash G by 1 day |
17 |
3900 |
80×17=1360 |
280+1×60+1×80=420 |
5680 |
Optimum cost = Rs. 5620
Optimum duration = 18 days