Normal Crash Normal Crash Crash Cost

Activity Slack Time Time Cost Cost Per Week

A $074$ $$400$ $$750$ $$116\mathrm{.}67$

B $1129$ $$1,000$ $$2,200$ $$400$

C $076$ $$800$ $$1,100$ $$300$

D $065$ $$600$ $$1,000$ $$400$

E $086$ $$1,200$ $$2,200$ $$500$

F $932$ $$800$ $$1,000$ $$200$

G $932$ $$500$ $$650$ $$150$

H $043$ $$400$ $$600$ $$200$

I $065$ $$900$ $$1,300$ $$400$ Which activities need to be crashed to reduce the project's completion time by $4$ weeks? How much does this cost?