Question (6) (10 Marks) A project is normally expected to be completed after 20 weeks but is required to be crash- completed in 18 weeks. The WBS of the project is as follows: Normal Completion Predecessor Work Package Crashed Completion Time (weeks) Cost ($1,000/week) Duration Cost (weeks) ($1,000/week) A AB 3 20 2 32 B 8 10 4 24 A C 12 10 7 19 A D 5 9 4 12 B.C [a] Create the Activity on Node (AON) network representation of this project. [b] Calculate the slack for each work package. [c] Identify the critical path under normal completion durations. [d] If the project is to be completed 2 weeks earlier. Create an optimal crash schedule for each work package in the project. [e] What is the total cost for speeding-up project completion?