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Standard IV

Mathematics

Perimeter of Regular Shapes

What will be ...

Question

What will be the cost of gardening 1 metre broad boundary around a rectangular plot having a perimeter of 340 metres at the rate of Rs.10 per square metre?

Rs.1700

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Rs.3400

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Rs.3440

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Cannot be determined

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None of these

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Solution

The correct option is C
Rs.3440

2(l+b) = 340 (given)
Area of the boundary = [(l+2) (b+2) -- lb] =2 (l + b) + 4 = 344
$∴$ Cost of gardening = Rs. (344 $\times$ 10) = Rs. 3440

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What will be the cost of gardening 1 metre broad boundary around a rectangular plot having a perimeter of 340 metres at the rate of Rs.10 per square metre?

The correct option is C Rs.3440 2(l+b) = 340 (given) Area of the boundary = [(l+2) (b+2) -- lb] =2 (l + b) + 4 = 344 ∴Cost of gardening = Rs. (344 × 10) = Rs. 3440

The correct option is C
Rs.3440

2(l+b) = 340 (given)
Area of the boundary = [(l+2) (b+2) -- lb] =2 (l + b) + 4 = 344
$∴$ Cost of gardening = Rs. (344 $\times$ 10) = Rs. 3440