Contract for construction crew and equipment 8 Build parking lots Exterior lighting 11 7 20 12 Build foundation Start Interior Interior 12 9 electrical Final wiring finish Purchase 8 14 12 material Exterior 7 electrical 17 5 5 3 3 3 Excavation 30 Building 6 construction 15 5 13 16 Plumbing Heating and air conditioning Partial paving 10 21 Sewage system Exterior landscaping and painting 16 6 17 3 Fumish Finish Merd INDONES A group of developers is building a new shopping center. A consultant for the developers has constructed the following project network and assigned activity times, in weeks. Determine the earliest and latest activity times, activity slack (Total float, free float, Independent Float, critical path, and duration for the project.