Use the information below to answer the following questi. $s$;

$\backslash$table$[[$Aativity$,\backslash$table$[[$Immediate$],[$Predecessor$($t$)]],\backslash$table$[[$Normal$],[$Time$],[($Day$)]],$Norimal,ContDay $($s$),\backslash$table$[[$Crath Tirme$],[($Dayi$)]]],[$A$,-,4,400,125,3],[$B$,$A$,5,800,200,4],[$C$,A,4,520,150,2],[$D$,$B$,3,600,225,2],[$E$,$C$,3,255,100,2],[$F$,$B$.$ E$,4,600,175,2]]$

$($a$)$ Draw the project networt?

$($b$)$ Find the critical path.

$($c$)$ Fiad the projet completion time and the corresponding cost

$($d$)$ What is the total cost if the project deadline is $13$ days

$($c$)$ Assume the project deadline to be $10$ days. The company has to bear $$170$ for each day of delay. Fiad the optimal number of days to crash the project.