[22] QUESTION 4 4. The table below depicts the set of activities needed to complete a project. The predecessor(s) for each of the activity as well as the duration time required to complete each activity (in days) are also indicated in the table. TIME (DAYS) ACTIVITY IMMEDIATE PREDECESSOR B D E F B, C D 120 20 40 30 50 60 E (4) a. Determine the project duration time. (5) b. Determine the critical path of the project. C. You can decrease (crash) the duration time for each of the activity at an additional expense, with a view to minimize the project completion time. The Table given below summarizes the normal and crash times as well as the normal and crash costs information for the aforementioned activities. Activity Normal Crash Cost Cost (Rand) (Rand) Normal duration (days) 120 20 40 30 50 60 Crash Duration (days) 100 15 30 20 40 45 12000 1800 16000 1400 3600 13500 14000 2800 22000 2000 4800 18000 If the owner wants you to finish the project in 260 days, and also promise to give you a bonus of R500 for been able to crash the project duration per day. Find the minimum possible cost for the project to be finished at this stipulated date, assuming that workers working on the project work for 5 days in a week. (13) OUESTION