Problem $4$:

Completely crash the following network schedule using complex compression, and find the optimum time and least cost. Draw the cost vs$.$ time curve.

$\backslash$table$[[$Activity$,$Duration,Cost, $$],[$Normal$,$Crash,Normal,Crash $1,$Crash $2,$Crash $3,$Crash $4],[$A$,6,4,800,890,1010,,],[$B$,12,8,1100,1225,1350,1475,],[$C$,10,6,1400,1475,1560,1650,1760],[$D$,8,5,1000,1035,1115,1195,1295],[$E$,6,4,900,965,1040,1130,],[$F$,4,3,800,825,865,,]]$

Overhead Costs $=$$$100/$day