Q15 of 97 Page 790

The cost of fencing a square lawn at RS. 14 per metre is RS. 2800. Find the cost of mowing the lawn at RS. 54 per 100m2.

Given:


Rate = RS. 14 per metre


Total Cost = RS. 2800


Rate of mowing = RS. 54 per 100 m2


Let the side of square field be s



Now,




= 200 m


Perimeter = 4 × side


⇒ 200 m = 4 × s



⇒ s = 50 m


Now,


Area = side2


= (50 m) 2


= 2500 m2


Therefore,


Cost of mowing 100 m2 = Rs 54




= Rs 1350


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