Question 12 (10 points) A project for building a wall has following activity times. The critical path of the project is A-C-D-F-H. Activity Normal Time (months) Crash Time (months) Normal Cost (S mil.) 1,000 800 600 1,500 1,300 900 900 500 Crash Cost (S mil.) 1,200 2,000 900 2,000 1,400 1,200 900 900 a. What is the total project cost? (3 points) b. If the project must be completed 1 month early, which activity should be crashed to keep costs minimized? (5 points) c. What is the total cost after crashing? [2 points)