Environment Recycling, Inc. must clean up a large automobile tire dump under a state environmental…

➤ How can the project be shortened by three weeks at lowest total cost?
Crash the lowest-cost items on the critical path. Reduce I by its full 2 weeks (cost +$400) and reduce D by 1 week (cost +$250). That shortens the project from 24 to 21 weeks. The total project cost becomes $8,910 (normal cost $8,260 plus $650 in crash premiums).