For the network shown below, the normal and crash durations for the activities in the project, together with their associated cast, are shown in the table after the network Assuming that the only way of reducing the total project time is by increasing costs: (i) Analyze the network and determine the earliest and latest event times, critical path and the duration of the project. (ii) Indicate which activities should be crashed to reduce the project time by three days. (iii) Determine the minimum possible project time and the total addirional cost to complete the project in this time. 5 4 Activity Normal Duration Days Cost $ Crash Duration Days Cost $ 1-2 2 450 600 1-3 4 400 600 2 5 1-4 6 350 700 2 250 1 400 150 3-5 3 100 2 4-5 4 1000 500 SOO 2 3 4-G 5 800 5-6 3 400 2 600