The area of a square shaped park field is 1764 m².  The breadth of a rectangular park is \(\frac{1}{7}\)th of the side of the square field and the length is four times its breadth.  What is the cost (in Rs) of leveling the park at Rs 30 per m².

4320

a² = 1764,  a = 42 m

b = \(\frac{1}{7}\) × 42 = 6m

l = 4 × 6 = 24m

Area = l × b = 6 × 24 = 144 m²

cost of leveling = 144 × 30 = Rs. 4320