Wha will be he cost of gardening 1 metre broad boundary around a rectangular plot having perimeter of 340 metres at the rate of Rs. 10 per metre ?
2(l + b) = 340 (Given)
Area of the boundary = [(l + 2) (b + 2) - lb]
= 2(l + b) + 4 = 344
`:.` Cost of gardening = Rs. (344 x 10) = Rs. 3440.
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