Question: The table below gives a projects activities, its predecessor(s) and the activity cost. All times are in days. Suppose the project must be finished in

The table below gives a projects activities, its predecessor(s) and the activity cost. All times are in days. Suppose the project must be finished in 20 days. What is the lowest extra cost incurred for finishing the project in 20 days?

Activity	Normal time	Minimum time	Crash cost ($/day)	predecessor
A	10	8	50	-
B	6	3	30	-
C	2	2	-	B
D	4	2	40	C
E	6	4	80	A
F	8	5	100	D,E

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