What will be the cost to plaster the inner surface of a well 14 deep and 4 m in diameter at the rate...........

Quantitative Aptitude ( CCS) Mensuration 3D

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What will be the cost to plaster the inner surface of a well 14 deep and 4 m in diameter at the rate of ? 25 per sq m ?

Rs. 4000

Rs. 4200

Rs. 4400

Rs. 5400

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Explanation:

Given that, depth of well (h) = 14 m
And, diameter of well = 4 m
∴ radius of well (r) = 2 m
Curved surface area of well = 2πrh
= 2 x 22/7 × 2 × 14 = 176 m²
? Rate of plaster = Rs. 25 per m²
∴ Total cost to plaster the well = 176 × 25 = Rs. 4400