Q$1)$ For the following schedule, draw the node network, perform the CPM calculations, mark the critical path, and draw the s curve with different scenarios

$\backslash$table$[[$Activity$,$Duration,Predecessors,Total cost$],[$A$,3,-,3,000],[$B$,5,-,10,000],[$C$,1,-,4,000],[$D$,1,$A$,16,000],[$E$,7,$B$,21,000],[$F$,6,$B$,12,000],[$G$,4,$C$,16,000],[$H$,3,$C$,15,000],[$I$,6,$D$,$E$,12,000],[$J$,4,$F$,$G$,12,000],[$K$,3,$H$,9,000]]$