Question

Given the data table below develop the precedence network and perform the CPM calculations. Then, using the proposed crashing strategy calculate the normal, least-cost, and crash duration for the project below. Calculate the cost associated with each duration. Indirect cost (overhead) is $120 per day.

Activity	IPA	Duration		Cost $
		Normal	Crash	Normal	Crash
A	-	5	4	$770	$900
B	-	3	2	$660	$700
C	A	7	4	$800	$1,070
D	A,B	4	3	$1,000	$1,110
E	B	6	4	$800	$920
F	C,D	6	5	$560	$630
G	D	5	3	$700	$810
H	F	8	4	$1,000	$1,260
I	E,G	4	3	$500	$580
J	H,I	3	2	$400	$600

Proposed crashing strategy:

Act	Duration		Cost $		Δ Cost	Δ Days	Δ cost Δ days	Days shortened
	Norm	Crash	Norm	Crash
A	5	4	770	900	130	1	130				1
B	3	2	660	700	40	1	40
C	7	4	800	1,070	270	3	90			3
D	4	3	1,000	1,110	110	1	110
E	6	4	800	920	120	2	60
F	6	5	560	630	70	1	70		1
G	5	3	700	810	110	2	55
H	8	4	1,000	1,260	260	4	65	4
I	4	3	500	580	80	1	80
J	3	2	400	600	200	1	200					1

Answer 1