10 cylindrical pillars of a building have to be painted The diameter of each pillar is 70 cm and the...........

Quantitative Aptitude ( CCS) Mensuration 3D

10 cylindrical pillars of a building have to be painted. The diameter of each pillar is 70 cm and the height is 4 m. What is the cost of painting at the rate of ? 5 per sq m ?

Rs. 400

Rs. 440

Rs. 480

Rs. 500

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Explanation:

Given that, diameter of each pillar = 70 cm
∴ Radius (r) = 35 cm = 0.35 m
And, height (h) = 4 m
We know that,
Surface area of a cylindrical pillar = 2πrh
= 2 x 22/7 × 0.35 × 4 = 8.8 m²
∴ Surface area of 10 pillar = 10 × 8.8 = 88 m²
Now, Total cost of painting = 5 × 88 = ? 440