6.43 Utama Computer is planning to design, manufacture and market the UCI palm-book. The project manager has listed the major activities that must be completed. The activities, times and costs are given below. Activity ABCDEFGHIKL Immediate Predecessor Time (months) Cost ($'000) Normal Crash Normal Crash B A, D C E, G E, G E, G 956625654653 534 10 12 9.2 4 11 11.6 1 4 3 3 4 3 1 46876696 5.3 7.4 10 8 8 10 9 8.6 H J. F (a) Using the normal times, construct a network for the project and identify all critical activities. (Ans: BDEHK) (b) Determine the project completion time and the total cost based on normal times. (Ans: 23 months, $87000) (c) Find the minimum cost required to complete the project within 20 months. (Ans: $89600) 6.44 The following table provides the data (activities, immediate predecessors, and durations) for building a new house. (a) Construct a network diagram, and state the critical path and the duration of the project. (Ans: ACDFGHJLNST, 38 days) (b) Assuming each activity starts at its earliest time, construct the time schedule (time chart) for the project.