Q$1$ Table Q$1$ are data for a small project. The indirect cost for this project is RM$1,000/$day$.$

TABLE Q$1$

$\backslash$table$[[$Activity$,$Predecessor,$\backslash$table$[[$Number$],[$of$],[$Labour$]],\backslash$table$[[$Normal$],[$Duration$],[($days$)]],\backslash$table$[[$Crash$],[$Duration$],[($days$)]],\backslash$table$[[$Normal$],[$Cost$],[($RM$)$X$1000]],\backslash$table$[[$Crash$],[$Cost$],[($RM$)$X$],[1000]]],[$A$,-,3,3,3,80,80],[$B$,$A$($SS$+1),4,16,10,70,88],[$C$,$A$,$ B$,4,8,5,150,210],[$D$,$B$,$ C$,8,4,3,350,400],[$E$,$C$,$ D$($FF$+3),6,5,3,100,180],[$F$,$E$,4,14,8,120,150]]$

$($a$)$ What is the highest direct cost slope for the critical activity?

$($b$)$ Calculate the new total cost for the project with all crash duration possibilities.