Given the following project: Activity Predecessor Normal Time (day) Normal Cost ($) Crash Time (day) Crash Cost ($) 4 800 2 1300 2400 B 10 1200 7 C 6 1100 4 1700 D A,B 7 1000 4 1600 E 10 2000 8 3000 F 5 900 C,D (a) Draw the network and find the critical path duration of the project, total cost of project using normal times. (b) Calculate the maximum time reduction and crash cost-per-day (all activities may be partially crashed) for each activity. Then fill the table below. (Note: Activity "F" cannot be crashed) Activity Maximum Time Reduction (day) Cost to Crash per Period ($/day) A B D E F (c) Find the optimal way of getting a 20-day delivery time. What is the project cost? (d) Find the optimal way of getting a 18-day delivery time. What is the project cost