Path PRTV is critical path and corresponding normal duration is 18 days.
Activity
tn
tc
Cn
Cc
Cn=
Cc−Cn
tn−tk
P
6
4
15000
25000
5000
Q
5
2
6000
12000
2000
R
5
3
8000
9500
750
S
6
3
7000
100000
1000
T
3
2
6000
9000
3000
U
2
1
4000
6000
2000
V
1
2
2800
2800
4000
For 18 days: Direct cost =66000 Indirect cost =18×5000=90000 Total project cost =156000 1st stage crashing : Crash activity R by 1 day. New project duration =17 days. T.P.C
=156000+1×750−1×5000=151750
2nd stage crashing : Crash activity Q & R simultaneously by 1 day. New project duration =16 days. T.P.C