Consider the following tables for the information about a certain project. a-) Draw the activity-on-node and activity-on-arrow networks of the project. b) Find the least cost way of completing the project in 18 days. Assume partial crashing is allowed. Note: For instance, activity B takes 5 days to be completed and can be crashed into 2 days maximum, which costs 190 - 70 = $120, therefore daily crash cost for activity B is 120/3= $40 Direct Costs Normal Crash Activity ID Predecessors Time Cost Time Cost A 4 $50 5 70 2 $190 C A 5 80 4 120 D C 4 40 2 120 E C 5 60 3 140 F B 5 50 90 DF 4 70 3 160 . DE 4 80 3 110