For the given problem,

Task

Predecessor

Normal Time

$($days$)$

Crash Time

$($days$)$

Normal Cost

Crash Cost

A

$3$

$2$

$40$

$120$

B

$7$

$5$

$30$

$80$

C

A$,$ B

$5$

$4$

$45$

$90$

D

A

$6$

$5$

$30$

$50$

E

C

$4$

$2$

$40$

$100$

F

D$,$ E

$5$

$4$

$55$

$75$

Answer the following questions:

a$.$ What is the normal cost of the project?

$$240$

b$.$ What is the length of the project?

$21$ days

c$.$ Which activity would you crash first to reduce the project by one day and what will be the cost to crash?

F; $$20$

d$.$ What is the maximum amount of days that this project can be crashed by$?$

$,$ and what is the total cost?