$3\mathrm{.}9$ Refer to the table in Problem $3\mathrm{.}8.$

a$)$ Draw the AON network for the construction activity.

b$)$ Draw the AOA network for the construction activity.Code Activity Description

Time

$($in hours$)$

Immediate

Predecessor$($s$)$

A Planning Find location; determine resource requirements $20$ None

B Purchasing Requisition of lumber and sand $60$ Planning

C Excavation Dig and grade $100$ Planning

D Sawing Saw lumber into appropriate sizes $30$ Purchasing

E Placement Position lumber in correct locations $20$ Sawing, excavation

F Assembly Nail lumber together $10$ Placement

G Infill Put sand in and under the equipment $20$ Assembly

H Outfill Put dirt around the equipment $10$ Assembly

I Decoration Put grass all over the garden, landscape, paint $30$ Infill, outfill