Activity Predecessors Time $($weeks$)$ Crash$*$ per week

A C$,$ E $42$ $$2000$

B A $52$ $$1000$

C G $66$ N$/$A

D C $32$ $$1000$

E G $52$ $$500$

F A$,$ D $62$ $$1250$

G none $52$ $$2250$

$*$Shortest possible time for the task

$1.$ Draw the project network and list the earliest start $($ES$),$ earliest finish $($EF$),$ latest start $($LS$)$ and latest finish $($LF$)$ for each task