Please place text to be copied Following tables shows information about activiti

Question

Please place text to be copied

Following tables shows information about activities in a project and their crashing costs. The critical path activities are B, D, and E. Activity Normal Cost Normal Time (weeks) Crash time (weeks) Crash Cost $2,000 $2,400 8 $3,000 $3,500 $1,000 $1,300 $2,000 $2,600 $8,800 $9,000 What is the project completion time? [5 points] If the project needs to be completed 3 weeks earlier than the normal project completion time, which activityl activities should be crashed? Explain why. (Assume that crashing an activity will NOT affect the critical path). [5 points] What is the cost of crashing? [5 points]

Explanation / Answer

Since the critical path activities are B, D, and E, the completion time is 7+6+9 = 22 weeks

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*Slope = (Crash Cost - Normal Cost) / (Normal time - Crash time)

Based on the minimum slope, first, we will select activity E and crash by 1 day

Then we will select activity B and crash it by 2 days.

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Cost of crashing = $200 x 1 + $250 x 2 = $700

Activity Normal Time Crash Time Normal Cost Crash Cost Slope* B 7 5 $3,000 $3,500 $250 D 6 4 $2,000 $2,600 $300 E 9 8 $8,800 $9,000 $200

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