Problem 5-15

Here is a network with the activity times shown in days:

a. Determine the critical path.

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

The following table shows the normal times and the crash times, along with the associated costs for each activity.

ACTIVITY	NORMAL TIME	CRASH TIME	NORMAL COST			CRASH COST
A	7	6	$	7,000		$	8,100
B	8	7		5,200			7,000
C	5	4		9,400			11,400
D	9	7		3,100			4,300
E	2	1		2,500			3,100
F	8	7		4,000			7,000
G	3	2		5,200			7,000

b-1. If the project is to be shortened by four days, which activities, in order of reduction, would be shortened? (You may select more than one answer. Single click the box with the question mark to produce a check mark for a correct answer and double click the box with the question mark to empty the box for a wrong answer.)

• A) A, C (or E), B (or A)
• B) C, D (or E), B (or A)
• C) D, D, A, B (or G)
• D) E, D

b-2. Find the resulting cost to crash.

Resulting cost $ ________

B(8) D19) F18) A(7) G(3) C(5) E/2)