A project involves the following activities:
Activity Predecessor Normal (Min.) Crash Cost of
Duration Duration Crashing/day
A - 4 days 3 days $100
B - 7 “ 4 “ $300
C A 2 “ 1 “ $400
D B, C 5 “ 4 “ $200
Suppose the benefit arising from reducing the project duration is $500/day. Which tasks should be crashed, and by how much? What is the total net benefit?
Please show step by step