A project has the following activities:

4. A project has the following activities: Normal Immediate Time Predecessors C.w.eeks) Actiyity B c none C D 4 9 4 6 8 3 4 Normal Cost ISL 3,000 5,000 7,000 6,000 4,000 4,000 2,000 Crash Tme 3 7 4 4 6 2 2 Crash Cost 5,000 8,000 7,000 8,000 8,000 9,000 7,000 a) b) c) d) Draw the network diagram based on normal time. What are potential paths (connected paths) and corresponding durations? What is the expected project completion time based on normal time? What is the most economical way and how much will it cost to reduce the completion time of the project by three weeks?