The critical path on a project has $4$ tasks, A$,$ B$,$ C$,$ and D$.$ The allowable amounts of crashing and the costs for crashing are given as

Task$$ #days allowed$$ $$$$/$day

$$ A$230$

$$ B$350$

$$ C$125$

$$ D$215$

To crash the project by $6$ days,$$

A should be crashed by $[$ Select $]["0","2","3","1"]$ days.

B should be crashed by $[$ Select $]["1","3","2","0"]$ days.

C should be crashed by $[$ Select $]["0","2","3","1"]$ days.

D should be crashed by $[$ Select $]["2","1","3","0"]$ days.

The order of crashing these will be $[$ Select $]["$BBBAAC$",$ "ABBCDD", "DDCAAB", "DDCBAA"$].$

The total cost of crashing by $6$ days will be$[$ Select $]["165","265","120","235"].$

$$