Dave Fletcher was able to determine the activity times for constructing his laser scanning machine. Fletcher would like to determine ES$,$ EF$,$ LS$,$ LF$,$ and slack for each activity. The total project completion time and the critical path should also be determined. Here are the activity times:

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

Dave's earliest start $($ES$)$ and earliest finish $($EF$)$ are:

$\backslash$table$[[$Activity$,$ES$,$EF$],[$A$,0,5],[$B$,0,6],[$C$,5,7],[$D$,5,6],[$E$,6,9],[$F$,6,12],[$G$,9,19],[$H$,12,18]]$

Dave's latest start $($LS$)$ and latest finish $($LF$)$ are:

$\backslash$table$[[$Activity$,$LS$,$LF$],[$H$,13,19],[$G$,9,19],[$F$,7,]]$

The Slack times are : The activites on the critical path are

The total completion time for Dave $=\_\_$ weeks