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5) The relevant project data are given as follows. Activity Predecessor(s) Normal time (weeks) Crash time Normal cost Crash cost Possible number of weeks to crash Cost/week to expedite -- 7 6 A B . 1 N C . 4 3 D B.C 5 st $7,000 5,000 9,000 3,000 2,000 4,000 5,000 $8,000 7,000 10,200 4,500 3,000 7,000 8,000 E D 2 1 F D 4 2 G E,F 5 4 a) Draw the AOA (Activity-On-Arc) diagram as shown in Chapter 13's Excel Worksheets. b) Formulate the problem of finding project completion time as a LP problem. [You would only need the first 3 columns of the table and the diagram from a) to do the job!) c) Reformulate the problem when crashing the project completion time of 3 weeks is required. That is, reformulate the problem when the project completion time is required to be shortened by 3 weeks. Obviously, crashing is based on shortening the project completion time by 3 weeks with the minimal additional cost. In order to formulate the problem, you need to fill in the blank columns of the table.]