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

B

C

D

A

E

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

$$

$1$

B

$$

$0$

C

$$

$1$

D

$$

$2$

E

$$

$3$

Part $3$

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

$$

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