Assume the network and data that follow:

ACTIVITY	NORMAL TIME (WEEKS)	NORMAL COST			CRASH TIME (WEEKS)	CRASH COST			IMMEDIATE PREDECESSORS
A	2	$	50		1	$	70
B	4		80		2		160		A
C	8		70		4		110		A
D	6		60		5		80		A
E	7		100		6		130		B
F	4		40		3		100		D
G	5		100		4		150		C, E, F

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

• A-D-F-G

• A-C-F-G

• A-B-E-G

• A-D-E-G

c. Demonstrate the crashing steps needed to minimize the cost of crashing down to various project lengths. Consider project lengths of 18, 17, 16, 15, 14, and 13 weeks. For each possible step down in project length, specify which activity would be crashed to achieve that length, compute the resultant length of each path in the project, and compute the crashing costs as shown in the table below. (Leave no cells blank - be certain to enter "0" wherever required.)

d-1. If the indirect costs for each project duration are $400 (18 weeks), $350 (17 weeks), $300 (16 weeks), $250 (15 weeks), $200 (14 weeks), and $150 (13 weeks), what is the total project cost for each duration?

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

• 17 weeks

• 13 weeks

• 16 or 15 weeks

• 14 or 15 weeks