2 (20 marks) A leading information technology company has a project involving the installation of a computer system involving eight activities. The following table lists immediate predecessors, activity times in weeks as well as other relevant information about the activities. Activity Immediate predecessor activity Normal duration (weeks) Normal cost Crash time (weeks) Cost if crashed A - 3 N$900 1 N$1 700 B - 6 N$2 000 3 N$4 000 C A 2 N$500 1 N$1 000 D B, C 5 N$1 800 3 N$2 400 E D 4 N$1 500 3 N$1 850 F E 3 N$3 000 1 N$3 900 G B, C 9 N$8 000 4 N$9 800 H F, G 3 N$1 000 2 N$2 000