Answer:
The total cost of the fence for one length of the yard is $1500
Step-by-step explanation:
Let the length and width of the rectangle be x and y respectively.
y = 90 ft
Area of a rectangle is:
A = xy
90x = 10800
x = 10800/90 = 120 ft
The fence cost $12.50 per linear foot
One length of the yard is:

The total cost of the fence for one length of the yard is $1500