There is a square park in the society. Rs. ______ is the cost of laying grass in the field at Rs. 10 per m2. The length of each side is 7 m.
Total cost of laying grass in the field = Area of the square park × Cost of laying grass per m2
Area of the square park = 7 × 7 = 49 m2
Total cost of laying grass in the field = 49 × 10 = Rs. 490