It is given in the question that,

Length of rectangular park, l = 175 m

Breadth of rectangular park, b = 125 m

Therefore,

Length of wire required for fencing the park = Perimeter of the park

= 2 × (l + b)

= 2 × (175 + 125)

= 2 × (300)

= 600 m

It is given in the question that,

Cost of fencing 1 m of the park = Rs. 12

Therefore, the cost of fencing 600 m of the rectangular park = 600 × Rs.12 = Rs 7200