Assume the network and data that follow:

$\backslash$table$[[$ACTIVITY$,\backslash$table$[[$NORMAL TIME$],[($WEEKS$)]],$NORMAL COST,$\backslash$table$[[$CRASH TIME$],[($WEEKS$)]],$CRASH COST,$\backslash$table$[[$IMMEDIATE$],[$PREDECESSORS$]]],[$A$,2,$$$50,1,70,-],[$B$,4,80,2,160,$A$],[$C$,8,70,4,110,$A$],[$D$,6,60,5,80,$A$],[$E$,7,100,6,130,$B$],[$F$,4,40,3,100,$D$],[$G$,5,100,4,150,$C$,$ E$,$ F$]]$

b$.$ Indicate the critical path when normal activity times are used.

A$-$C$-$F$-$G

A$-$D$-$F$-$G

A$-$B$-$E$-$G

A$-$D$-$E$-$G

c$.$ Compute the minimum total direct cost for each project duration based on the cost associated with each activity. Consider durations of $13,14,15,16,17,$ and $18$ weeks.

Note: Leave no cells blank $-$ be certain to enter $"$O$"$ wherever required.

Answer is complete but not entirely correct.

$\backslash$table$[[$Project Duration:,$18$ Weeks,$17$ Weeks,$16$ Weeks,$15$ Weeks,$14$ Weeks,$13$ Weeks$],[$Length of path ABEG,$18vv,17vv,16,15vv,14vv,130],[$Length of path ACG,$150,14o.,14vv,14,15,130],[$Length of path ADFG,$17vv,16,16,15?,14,130],[$Activity crashed,None,$(),2,(,B$&$F,x,x$