The City of Berlin has decided to build a botanical garden and picnic area in the heart of the city for the recreation of its citizens. The precedence table for all the activities required to complete the project is given below. Draw a network diagram and determine all the relevant start and finish times. How long will the project take and what activities will be most important to completing the project on time? Activity Description Immediate Predecessor None Time (hour) 20 Planning Purchasing Excavation Sawing Placement 60 100 30 20 Find location, determine resource requirements Requisition of lumber and sand Dig and grade Saw lumber into appropriate sizes Position lumber in correct locations Nail together lumber Put sand in and under the equipment Put dirt around the equipment Plant grass all over the garden, landscape, and paint. Planning Planning Purchasing Sawing, Excavation Placement Assembly Assembly Infill, Outfill Assembly Infill Outfill Decoration 10 20 10 30