4. Suppose a project with the following data: Activity A Duration (Week) Predecessor 2 B 4 C 3 D 5 E 3 F 1 G 4 A A, B C D, E F Draw the AON diagram of the project and schedule the project. What are the project's completion time and the critical path(s)? 5. Consider the project described in question 4. Assume that the activities durations given in question 4 are the normal durations. The crashed durations, normal costs, and crashed costs are obtained as follows: Activity A Crashed duration 1 Normal cost ($) 100 Crashed cost ($) 100 B 2 80 140 C 3 100 150 D 3 220 300 E 2 240 350 F 1 140 170 G 2 60 110 Assume that the overhead (indirect) cost per week is $80 for the project. All times are in week. Obtain the optimal project completion time with the lowest total cost of the project.