Environmental Recycling, Inc. must clean up a large automobile tire dump under a state environmental cleanup contract. The tasks, durations (in weeks), cost, predecessor relationships are shown as follows:
|
Activity
|
Predecessor(s)
|
Normal Time
|
Crash Time
|
Normal Cost
|
Crash Cost
|
|
A
|
-
|
5
|
4
|
$400
|
$750
|
|
B
|
A
|
8
|
6
|
1600
|
2200
|
|
C
|
A
|
7
|
6
|
800
|
1100
|
|
D
|
-
|
6
|
5
|
600
|
1000
|
|
E
|
B, D, C
|
8
|
6
|
1200
|
2200
|
|
F
|
D
|
3
|
2
|
800
|
1000
|
|
G
|
D
|
3
|
2
|
500
|
650
|
|
H
|
E
|
4
|
3
|
400
|
600
|
|
I
|
F, G, H
|
6
|
5
|
900
|
1300
|
What is the Earliest start and Earliest finish for all activities left to right?
What is the Latest Finish and Latest start for all activities right to left?