Chapter $17,$ problem $7.$

Suppose it is now the end of the seventh day and that activities A and B have been completed, while activity D is $50$ percent completed. Time estimates for the completion of activity D are $5,6,$ and $7.$ Activities C and H are ready to begin.

The partners have decided that shortening the project by two days would be beneficial, as long as it doesn$$t cost more than about $$20,000.$ They have estimated the daily crashing costs for each activity in thousands, as shown in the part d table. Which activity should be crashed first?