Eight maintenance activities, their normal durations in weeks, and the crew sizes for the normal conditions are as follows: Activity Duration (weeks) Crew size AC 4 6 BC 6 8 BE 3 3 CD 2 3 CE 4 2 DF 6 4 EF 5 5 FG 4 8 i) Represent the maintenance project in the form of an activity-event network. ii) Identify the critical path and find the minimum time for project completion. iii) Extra crew members can be used to expedite activities BC, DF and EF at a cost given below: Extra crew Weeks saved Crash cost per week 1 1 $100 2 2 $125 3 2 $150 4 3 $200 If there is a penalty cost of $1,200 per week beyond the minimum maintenance time of 16 weeks, then recommend the minimum-cost schedule.