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.

Contract for construction crew and equipment 1 8 Exterior lighting 7 Build parking lots 11 20 12 Build foundation Exterior landscaping and painting 16 6 2 Start Interior 12 Interior electrical Final finish wiring Purchase 8 14 material Exterior 12 electrical 7 17 5 5 17 3 3 3 3 9 Fumish Excavation 30 Building 6 construction 13 15 5 2 16 Heating and air conditioning Partial paving 10 21 Plumbing Sewage system Finish