Question

Suppose there are 8 activities in your project with the following information.

Activity	Immediate Predecessor	Processing Time (days)	Processing Cost ($ per day)
A	B	5	20
B	-	4	40
C	A,B	6	30
D	A	7	10
E	C,D	6	25
F	C	5	40
G	E,F	4	25
H	F	3	50

What is the total project lead time?

a.) 40 b.)26 c.) 23

What activity is not part of the critical path?

a.) activity E b.) Activity C c.)Activity D

If activity F does not start once it is ready, but it is late for 3 days. What will happen to the project lead time?

a.)Will be 2 days delay b.)Does not change c.)Will be 1 day delay

If activity E does not start once it is ready, but it is late for 2 days. What will happen to the project lead time?

a.)Does not change b.)Will be 1 day delay c.)Will be 2 days delay

Answer 1

Below is the calculation of ES, EF, LS & LF -

Activity	IP	Processsing (Days)	ES	EF	LS	LF	Slack
B	-	4	0	4	0	4	0
A	B	5	4	9	4	9	0
C	A,B	6	9	15	10	16	1
D	A	7	9	16	9	16	0
E	C,D	6	16	22	16	22	0
F	C	5	15	20	17	22	2
G	E,F	4	22	26	22	26	0
H	F	3	20	23	23	26	3

Below is the screenshot of the formula applied -

Below is the answer ot the question basis above calculated result -

What is the total project lead time - b.)26

What activity is not part of the critical path- b.) Activity C

If activity F does not start once it is ready, but it is late for 3 days. What will happen to the project lead time - c.)Will be 1 day delay (Since F has a slack of 2 days hence 3 days delay will dekay the project by 1 days (3-2 = 1 day)

If activity E does not start once it is ready, but it is late for 2 days. What will happen to the project lead time - c.)Will be 2 days delay (Activity delay will delay the project by 2 day as it has 0 slack)