4. Consider the following project. Task Immediate Optimistic Most Predecessors probable Marks-10 Pessimistic Crash Normal Crash Time Cost Cost A 4 6 8 4 1000 1900 8 EE B 6 8 16 7 1000 1800 AB 2 4 6 2 1500 2700 D 8 10 24 2000 3200 7 10 13 7 5000 8000 E 4 6 8 4 3000 4100 G C 4 6 20 5 8000 10250 H D,F,G 4 6 8 4 5000 6400 I DF 4 6 14 4 10000 12400 J H 3 4 5 3 4000 4400 K IJ 2 6 3 5000 5500 a. Draw a project network b. Find the critical path and expected project completion time. c. Assuming that management desire a 12 weeks project completion time. What activity should be crashed? d. Activity schedule table after crashing. e. Find total project cost after crashing 4 4