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[tex]\huge{ \textbf{ \color{teal}{ Αɳʂɯҽɾ :}}}[/tex]

[tex]{ \textsf{Total cost of fencing = Rs. 200}}[/tex]

[tex] \textsf{Cost of fencing per meter= Rs. 2.5}[/tex]

[tex] \tiny{ \textsf{Perimeter Total cost Cost per meter = Total cost ÷Cost per meter}}[/tex]

[tex] \textsf{=200 ÷2.5} \\ { \textsf{80 m}}[/tex]

[tex] \tiny \textsf{Let the side of the square be a. Then, Perimeter = 4a}[/tex]

[tex]{ \textbf{According to question,}}[/tex]

[tex] \textsf{4a=80}[/tex]

[tex] \textsf{⇒a = 80 ÷ 4 = { \boxed{ \textsf{20 m}}}}[/tex]

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Let's assume that the length of one side of the square field is "x" meters.

The perimeter of the square field is equal to the sum of the length of its sides, which is 4x meters.

We know that the cost of putting a fence around the field is Rs 2.50 per meter, and the total cost is Rs 200.

So, the cost of putting a fence around the field is:

4x * Rs 2.50 = Rs 10x

According to the problem, Rs 10x = Rs 200, so:

x = 20 meters

Therefore, the length of one side of the square field is 20 meters.