Question $2$

$(20$ marks$)$

A leading information technology company has a project involving the installation of a computer system involving eight activities. The following table lists immediate predecessors, activity times in weeks as well as other relevant information about the activities.

$\backslash$table$[[$Activity$,\backslash$table$[[$Immediate$],[$predecessor$],[$activitv$]],\backslash$table$[[$Normal$],[$duration$],[($weeks$)]],\backslash$table$[[$Normal$],[$cost$]],\backslash$table$[[$Crash$],[$time$],[($weeks$)]],\backslash$table$[[$Cost if$],[$crashed$]]],[$A$,-,3,N$$$900,1,N$$$1700$