4. A project has the following activities

4. Apr* has tie following activities: Nonnal D 4 9 4 6 8 3 4 cost 7000 6.000 4.000 4.000 crash Time 3 7 4 4 6 2 2 Cost 5.000 8.000 7.000 8,000 9.000 7,000 a) tte nework diagram based normal dnw. b) What are potential paths (connected paths) and corresponding c) What b the pr*ct completion time based on normal tme? What is the most economical wa and how much will it to reduce