Pleaese Explain Answers

A project is broken down into the following activities (In the actual exam, the network diagram will be given to you): Activity Immediate Predecessor Time (days) 7 A 3 B C A 5 D B,C 2 D E D 4 E.E 5 4 Nu F G a. Using the two-pass method, find the critical path and project duration b. Compute the slack times of each activity. The following table shows the normal times and crash times, along with the associated costs for each activity. C. Activity Normal Time (days) Crash Time (days) Normal Cost ($) A 7 3 B C 6 2 3 Crash Cost ($) I 8,000 7,000 10,200 4,500 3,000 7,000 8,000 D 4 5 2 7,000 5,000 9,000 3,000 2,000 4,000 5,000 4 E 1 2 F G 4 5 4 If the project duration is to be shortened by four days, show which activities, along with the sequence, should be crashed