Activity Description Immediate Normal Crash Normal Crash Predecessors Time Time Cost Cost A Design 15,000 15,000 B Build internal components A 22,000 23,000 Modify roof and floor A 30,000 34,000 Construct collection stack B 26 000 26,750 E Pour concrete and install frame B. C 48,000 49.000 F Build high-temperature burner D 56.000 58,400 G Install pollution control system D 30,000 30.500 H Install air pollution device E. F 80.000 84,500 Inspect and test G. H 16.000 19,000 (a) Draw the CPM network (Activity-on-node) with the Normal Time estimates for all activities. Calculate the earliest start time, earliest finish time, latest start time and latest finish time of all activities. Determine the expected project completion time? (8 marks) (b) Determine the slack times for those non-critical activities? (2 marks) (c) What is the total cost of the project if it is completed at the time that calculated from part (a)? (2 marks) (d) Suppose that the commany has been given only 13 weeks (instead of 17 weeks) to install the new pollution control equipment or face a court ordered shutdown. How you would shorten the project completion time cost-effectively in order to prevent shutdown? (6 marks) Say something