Problem 5-20

Assume the network and data that follow:

ACTIVITY	NORMAL TIME (WEEKS)	NORMAL COST			CRASH TIME (WEEKS)	CRASH COST			IMMEDIATE PREDECESSORS
A	4	$	40		3	$	60
B	3		90		1		140		A
C	7		60		4		90		A
D	6		120		5		130		A
E	5		110		3		160		B
F	7		70		5		100		D
G	4		80		3		120		C, E, F

b. Indicate the critical path when normal activity times are used.

	A-D-E-G
	A-B-E-G
	A-C-F-G
	A-D-F-G

c. Compute the minimum total direct cost for each project duration based on the cost associated with each activity. Consider durations of 16, 17, 18, 19, 20, and 21 weeks. (Leave no cells blank - be certain to enter "0" wherever required.

	ABEG
Length of path	ACG
	ADFG
Activity crashed		(Click to select)DGAFE & FNone	(Click to select)ANoneGE & FFD	(Click to select)E & FDANoneFG	(Click to select)GFNoneDE & FF	(Click to select)DFE & FAANone	(Click to select)ADFNoneGG
Crash cost
Cum. crash cost
Total direct cost

d-1. If the indirect costs for each project duration are $400 (21 weeks), $350 (20 weeks), $300 (19 weeks), $250 (18 weeks), $200 (17 weeks), and $150 (16 weeks), what is the total project cost for each duration?+

Duration	Total Costs
21	$
20
19
18
17
16

d-2. Indicate the minimum total project cost duration.

	16 weeks
	17 weeks
	13 weeks
	14 or 15 weeks