The project network along with normal and crash data are provided below. Crash the project network by $4$ days. What added cost is required to crash the project?

Note: Please show how you crashed the project $($i$.$e$.,$ which activities were crashed and by how many days they were crashed. Also provide the sequence in which the project was crashed$).$

$\backslash$table$[[$Activity$,\backslash$table$[[$Normal$],[$Time $($Days$)]],\backslash$table$[[$Crash$],[$Time $($Days$)]],\backslash$table$[[$Normal$],[$Cost$]],\backslash$table$[[$Crash$],[$Cost$]],\backslash$table$[[$Crash$],[$Cost $/$ Day$]]],[$A$,6,4,500,800,],[$B$,3,2,200,400,],[$C$,7,4,400,1000,],[$D$,3,1,200,500,],[$E$,2,1,300,550,],[$F$,3,2,300,500,]]$