From question d) answer, i wonder why they crash only activity E instead of crash both E and B because in the question it asks the maximum time that can be crashed. so, if i crash both E and B the project duration will be 6 instead of 7 and i feel this is the right maximum time can be crashed. If it about price, when crashing ADG, why they crash activity A which has the same crash cost as B.

... 3.20 Development of a new deluxe version of a particular software product is being considered by Ravi Behara's software house. The activities necessary for the completion of this project are listed in the following table: In the critical path ADG, maximum scope for crashing exists 1 week in activity A, 4 weeks in activity D and 2 weeks in activity G. The cost of crashing the ADG path is taking into account crash costs per week 1x $600+ 4x $75+2 x $300 = $1,500 The total duration reduces to 9 weeks from 16 weeks in the ADG path. Normal Time (weeks) Crash Time (weeks) Now the duration of path BEG is Immediate Predecessor(s) Activity 2 weeks + 6 weeks + 2 weeks=10 weeks This path becomes critical and there is scope in reducing duration in activities B and E. 3 3 Normal Crash Cost Cost $2,000 $2,600 2,200 2,800 500 500 2,300 2,600 900 1,200 3,000 4,200 1,400 2,000 Comments (1) Step 7 of 7 A Between the two, the crash cost per week for activity E at $100 per week is cheaper than the crash cost per week for activity B at $600 per week. Therefore, reduce duration of activity E by one week at an additional cost of $100. The total additional crashing cost $1,500+$100 = $1,600) and the project duration is only 7 weeks. It is not possible to reduce the project duration further. a) What is the project completion date? b) What is the total cost required for completing this project on nor- mal time? c) If you wish to reduce the time required to complete this project by 1 week, which activity should be crashed, and how much will this increase the total cost? d) What is the maximum time that can be crashed? How much would costs increase? Px