The information related to project crashing is shown in the following table.

Activity

Normal

Duration $($hours$)$

Normal

Cost $($$$)$

Crash

Duration $($hours$)$

Crash

Cost $($$$)$

A

$2$

$10$

$2$

$10$

B

$3$

$15$

$2$

$23$

C

$5$

$25$

$4$

$29$

D

$3$

$20$

$1$

$24$

E

$6$

$30$

$4$

$45$

F

$1$

$5$

$1$

$5$

G

$7$

$35$

$6$

$50$

H

$10$

$50$

$7$

$80$

If we want to reduce the project duration by $1$ hour, what will be the crashing cost?