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CPM : Crashing

The project manager of a task force planning the construction of a domed stadium has hoped to be able to complete construction prior to the start of the next college football season. After reviewing construction time estimates, it now appears that a certain amount of crashing will be needed to ensure project completion before the season opener. Given the following time and the cost estimates, determine a minimum cost crashing schedule that will shave five weeks off the project length. Note: no activity can be crashed for more than 2 weeks.
(Crashing Costs)

activity immediate predecessor normal time (weeks) 1st week 2nd week

A - 12 $15,000 $20,000
B A 14 10,000 10,000
C - 10 5,000 5,000
D C 17 20,000 21,000
E C 18 16,000 18,000
F C 12 12000 15000
G D 15 24000 24000
H E 8 - -
I F 7 30000 -
J I 12 25000 25000
K B 9 10000 10000
M G 3 - -
N H 11 40000 -
P H, J 8 20000 20000
END K, M, N, P

ANSWER IS CRASH SCHEDULE 1 WEEK EACH C,C,F,F,E,P

PLEASE DRAW THE PRECEDENCE DIAGRAM ALSO CONSTRUCT A CRASHING TABLE THAT SHOWS STEP BY STEP, THE ACTIVITIES YOU CHOOSE TO CRASH, THE INDIVIDUAL COST AND RUNNING TOTAL OF COSTS TO ACHIEVE THE FINAL OUTCOME.

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