ABC developer is coordinating the construction of an office complex. As part of the planning process, the company generated the following activities listed in table Q1. The table shows the details of the project activities and times estimated in weeks and the cost per week for each activity. Activity Immediate Predecessor Time (Week) Cost (RM/week) A 4 1500 B 3 2300 A 2 2600 D B 9 1900 E AB 3 3000 F AC 4 1000 D 2 2300 H AEF 7 1200 GD 4 2700 GD 4 1400 K E,F,G,HI 9 2100 - J a. Draw the project network diagram b. Identify the critical path activities, expected time to complete the project, slack time for each activity and estimate the expected total cost of the project