12. Following are the various activities involved in a project. The cost and time information for these activities is given below:

(a) Draw the PERT network.

(b) Find out the critical path and the expected project completion time.

(c) What is the minimum possible project completion time after crashing the activities involved in the project and the associated cost of completing the project? (MIB, Delhi, 2005)

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Immediately Activity Preceding Activity (days) Normal Crash Time Cost Time Cost (Rs) (days) (Rs) ABCDEFGH 3 140 2 210 6 215 10 5 275 2 160 - 240 A 4 130 3 180 A 2 170 A 7 165 14 250 285 B, D 4 210 3 290 C, E 3 110 2 160