The City Commission of Nashville has decided to build a botanical garden and picnic area in the heart of the city for recreation of its citizens. The precedence table for all activities required to construct this area successfully is given below: TIME IMMEDIATE COD ACTIVIT IN PREDECESSO F Y DESCRIPTION HOURS R Find location; determine resource A Planning requirements 20 None Purchasi Requisition lumber ng and sand 60 Planning Excavati C ng Dig and grade site 100 Planning Saw lumber into D Sawing appropriate sizes 30 Purchasing Placeme Position lumber in Sawing; E nt correct locations 20 Excavating Assembl Nail lumber F V together 10 Placement Put sand in and under the G Infill equipment 20 Assembly Put dirt around H Out fill equipment 10 Assembly Put grass all over Decorati the garden & on landscape 30 Infill; Out fill 1 . Draw a Gantt Chart for the whole construction activity. 2 . Draw the Activity-On Node for the construction activity. 3 . Draw the Activity on Arrow for the construction activity. We know that the CODE C is the longest in the process. Estimates of time range from an optimistic time (a) of 70