The table below provides cost and time estimates of seven activities of a project.

Time estimates. Directcosts ActivityNormalCrash.Normalcrash

(1,2) 2. 1. 10. 15

(1,3) 8. 5. 15. 21

(2,4). 4. 3. 20. 24

(3,4) 1. 1. 7. 7

(3,5). 2. 1. 8. 15

(4,6). 5. 3. 10. 16

(5,6). 6. 2. 12. 36

(I) Draw the project network corresponding to normal time.

(ii) Determine the critical path and the normal duration and normal cost of the project.

(iii) Crash the activities so that the completion reduces to 9 weeks with minimum additional cost.