The perimeter of a rectangular plot is 210 m Find the cost of gardening 2 m broad boundary around re...........

Quantitative Aptitude ( CCS) Mensuration 2D

The perimeter of a rectangular plot is 210 m. Find the cost of gardening 2 m broad boundary around rectangular plot whose perimeter The cost of gardening is Rs 14 per m²?

Rs 6450

Rs 6400

Rs 6480

Rs 6104

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Explanation:

Answer & Explanation
Rs 6104
Explanation:
Given 2(l+b) = 210
2 m broad boundary means increase in l and b by 4 m
So area of the boundary will be [(l+4)(b+4) – lb] = 4(l+b) + 16 = 2*[2(l+b)] + 16 = 2*210 + 16 = 436 m2
So cost of gardening = 436*14 = 6104