Apply the formula of area of square.

Area of rectangle = Area of square

A square is a rectangle in which length = breadth = side = S

Apply the formula of area of rectangle.

Calculate the area of one wall, then find the cost of four walls accordingly.

Definition of area for a rectangle

\\(Area = \\frac{total cost}{rate}\\)

Recall the concept of area of rectangle.

Convert mixed fraction into improper fractions. Then convert into accordingly.

Apply the formula of perimeter of square to calculate side of it. Then solve it accordingly.