Given below are the normal and crashing data and other information for a project

Question

Given below are the normal and crashing data and other information for a project. Compute (a) the crash slope (ie crash cost per day) for each activity, (b) the normal project cost, (c) prioritized the list of activities for crashing from best to worst (d) the project cost if it is to be completed 2 days earlier, the best activities to crash, and alternative critical paths, if any, (e) the earliest time the project can be completed, and (f) the least cost of early completion Note: Activities with the same normal and crash durations cannot be crashed Activity Immediate ES LS EF LF Slack Normal Crash Norm Crash Predecessor Time|Time (days) Time (Days) Cost K$Cost K$ 0 06 60 084128 0 451 6 6 12 120 12 1215 15 0 4514151 15 1521 21 0 10 12 38 36 40 20 30 10 20 B. D 50 100 10 E, F 2

Explanation / Answer

Ans A and B

C.

D.

For 2 days earlier:

E and F:

So the following provides the earliest :

E. Time = 10 days

F. Cost = 295

Ans A Dec Var Assumed cost Slope Task Pre Start End Time to take Normal T Crash Normal cost Crash cost Per time Crash Cost Crash A 0 6 6 <= 6 >= 2 10 38 7 10 No B 0 4 4 <= 4 >= 4 12 12 0 12 No C 0 4 4 <= 4 >= 2 18 36 9 18 No D A 6 12 6 <= 6 >= 2 20 40 5 20 No E B,D 12 15 3 <= 3 >= 2 30 33 3 30 No F C 4 14 10 <= 10 >= 6 10 50 10 10 No G E,F 15 21 6 <= 6 >= 2 20 100 20 20 No 0 0 0 Finish Ending 21 Total 120 <= Ans B Total cost 120 Deadline 21 Minimize Obj Func

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