Section A - Calculation Questions (36%). Answer ALL questions in this section. An online grocery company is building a new automated factory in Kwun Tong. Table 1 contains the activities that need to be completed for this project. Based on this information, answer Question Al to Question A2. Table 1 A New Automated Factory Project Activity Immediate Normal Normal Crash Crash Predecessor Time Cost Time Cost (weeks) (S) (weeks) (S) A None 8 180 5 300 B A 11 150 9 180 A 4 140 2 180 D 4 110 1 125 E 7 120 5 150 F D,E 6 240 5 245 G B 4 170 2 180 H F,G 2 80 1 125 Question Al (a) Draw the project network diagram. Determine the early start, early finish, late start and late finish of each activity. (10 marks) (b) What is the normal project duration of the project? (1 mark) (c) Indicate the critical path. (2 marks) (d) What is the total slack of activity B? (1 mark)