if an activity whose normal duration is

$1$

$8$

$$

$$

weeks can be shortened to

$1$

$4$

$$

$$

weeks for an added cost of

$5$

$0$

$0$

$0$

$$

$$

what is the crash cost per period

$1$

$2$

$5$

$0$

$,$

$3$

$5$

$7$

$.$

$1$

$,$

$2$

$0$

$0$

$0$

$0$

$,$

$1$

$0$

$0$

$0$

$,$

$5$

$0$

$0$

$0$