1. Find out the critical path & completion time of the following activity plan. Activity Immediate Normal Normal Crashing Crashing Predecessor time Cost Time Cost A 4 150 2 200 B 5 200 4 500 C A,B 3 500 2 600 D B, C 6 300 4 600 E C 6 400 5 500 F E,D 3 500 1 900 A. Calculate crash cost per day for each activity B. What is the estimated completion time? C. What is the best option to crash the project to complete in 2 days earlier? D. What is the best option to crash the project to complete in 4 days earlier? (Indicate the number of days that any activity can be crashed)