M$6\_5$ A new supply ordering system needs to be installed as soon as possible. The table below lists the project's activities and their predecessors. Also provided is the cost information to reduce the standard activity times.

$\backslash$table$[[$ACTIVITY$,\backslash$table$[[$IMMEDIATE$],[$PREDECESSORS$]],\backslash$table$[[$STANDARD$],[$TIME$],[($DAYS$)]],\backslash$table$[[$STANDARD$],[$COST$]],\backslash$table$[[$CRASH$],[$TIME$],[($DAYS$)]],\backslash$table$[[$CRASH$],[$COST$]]],[$A$,--,7,$$$2,000,5,$$$3,500$