Office Automation Inc., developed a proposal for implementing a software system that will standardize the accounts payable function by automatically issuing an electronic payment upon receipt of the vendor invoice. Contained in the proposal is a list of activities activities.

$\backslash$table$[[,$Time $($weeks$),$Cost $($$$1,000$s$),],[$Activity$,$Description,$\backslash$table$[[$Immediate$],[$Predecessor$]],$Normal,Crash,Normal,Crash$],[$A$,$Plan needs,,$10,8,30,70],[$B$,$Order equipment,A$,8,6,120,150],[$C$,$Install equipment,B$,10,7,100,160],[$D$,$Set up training lab,A$,7,6,40,50],[$E$,$Conduct training course,D$,10,8,50,75],[$F$,$Test system,C$,$ E$,3,3,60,]]$

$($a$)$ Develop a project network

$($i$)$

$(1)$

$(1)$

$($b$)$ Develop an activity schedule

$\backslash$table$[[$Activity$,\backslash$table$[[$Earliest$],[$Start$]],\backslash$table$[[$Latest$],[$Start$]],\backslash$table$[[$Earliest$],[$Finish$]],\backslash$table$[[$Latest$],[$Finish$]],$Slack$],[$A$,,,,,$