The General Ottawa's hospital is expanding the services in an area of specialization. They need to train personal for the new services. There are multiple activities required to be performed before the unit can be in service. The activities in general follow the table:

$\backslash$table$[[$Activity$,\backslash$table$[[$Immediate$],[$Predecessor$]],$Time $($Days$)],[$A$,-,2],[$B$,-,5],[$C$,-,1],[$D$,$B$,10],[$E$,$A$,$D$,3],[$F$,$C$,6],[$G$,$E$,$F$,8]]$

Represent the AON network, identify the critical path, calculate the total completion time of the project, calculate slack times. Comment $-$ explain the answers!