Answer:
It will cost $80,000 to fence that area.
Explanation:
Barbed-wire fencing costs $20,000 per mile to set up.
The property that is to be fenced is a perfect square with sides that are one square mile each.
The perimeter of the property
= [tex]Side\ \times\ 4[/tex]
= [tex]1\ square\ mile\ \times\ 4[/tex]
= 4 square miles
The cost of fencing
= [tex]Length\ \times\ Cost[/tex]
= [tex]4\ \times\ \$ 20,000[/tex]
= $80,000
