Extra credit

$4.$ Below is the table which includes the information of a new project of ABC Inc.

Table $1$

$\backslash$table$[[$Activity$,$Predecessor,$\backslash$table$[[$Normal$],[$Time $($days$)]],\backslash$table$[[$Crashing$],[$Time $($days$)]],\backslash$table$[[$Crashing$],[$Cost$/$day$]]],[$A$,-,5,1,$$$200$