What is the minimum cost of crashing the following project that Roger Solano manages at Slippery Rock University by 4 days?

Activity	Normal Time (days)	Crash Time (days)	Normal Cost	Total Cost with Crashing	Immediate Predecessor(s)
A	5	4	$800	$1,100
B	7	5	$200	$500
C	4	3	$600	$650
D	6	3	$750	$1,500	A
E	6	4	$1,200	$1,650	C

By how many days should each activity be crashed to reduce the project completion time by 4 days?

Activity	Each Activity Should be Reduced BY (days)
A
B
C
D
E

The total cost of crashing the project by 4 days is $ __________.