C$.$ In cell G$21,$ calculate the value of link. The screenshot is as shown below:

A

B

C

D

E

F

G

$1$

J

K

L

Build

Flow From To Road? Cost Link Area Harvest?

Value Supply$/$Demand Net

$0$

$1$

$4$

$0$

$$9$

$0$

$1$

$0$

$$15$

$0$

$0$

$2$

$0$

$0$

$$0$

$0$

$2$

$0$

$$7$

$0$

$0$

$3$

$2$

$0$

$$13$

$0$

$3$

$0$

$$10$

$0$

$0$

$3$

$6$

$0$

$$12$

$0$

$4$

$0$

$$12$

$0$

$0$

$4$

$5$

$0$

$$14$

$0$

$5$

$0$

$$8$

$0$

$0$

$5$

$2$

$0$

$$15$

$0$

$6$

$0$

$$17$

$0$

$0$

$5$

$8$

$0$

$$13$

$0$

$7$

$0$

$$14$

$0$

$0$

$6$

$3$

$0$

$$12$

$0$

$8$

$0$

$$18$

$0$

$0$

$6$

$9$

$0$

$$13$

$0$

$9$

$0$

$$13$

$0$

$0$

$7$

$4$

$0$

$$15$

$0$

$10$

$0$

$$12$

$0$

$0$

$8$

$5$

$0$

$$13$

$0$

$11$

$0$

$$10$

$0$

$0$

$8$

$9$

$0$

$$12$

$0$

$12$

$0$

$$11$

$0$

$0$

$9$

$6$

$0$

$$13$

$0$

$0$

$0$

$0$

$9$

$8$

$0$

$$12$

$0$

$0$

$10$

$11$

$0$

$$11$

$0$

Road cost

$0$

$11$

$8$

$0$

$$12$

$0$

Timber Value

$$0$

$0$

$12$

$9$

$0$

$$10$

$0$

Profit

$$0$