What is the minimum cost of crashing the following project that James Walters manages at Athabasca University by $4$ days?

$$

Activity

Normal Time$($days$)$

Crash Time$($days$)$

Normal Cost

Crash

Cost

Immediate$$ Predecessor$($s$)$

A

$6$

$5$

$ $900$

$ $1$ comma $000$

long dash

B

$8$

$6$

$ $300$

$ $400$

long dash

C

$4$

$3$

$ $500$

$ $600$

long dash

D

$5$

$3$

$ $900$

$ $1$ comma $200$

A

E

$8$

$5$

$ $1$ comma $000$

$ $1$ comma $600$

C

Part $2$

By how many days should each activity be crashed to reduce the project completion time by $4$ days? Fill in the table below. $($Enter your responses as whole numbers.$)$

Activity

Each Activity Should be Reduced BY

$($days$)$

A

$$

enter your response here

B

$$

enter your response here

C

$$

enter your response here

D

$$

enter your response here

E

$$

enter your response here

Part $3$

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

$$

enter your response here. $($Enter your response as a whole number.$)$