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Question

# 10 cylindrical pillars of building have to be painted.If the diameter of each pillar is 50m and the height is 4m.Find the cost of painting at the rate of Rs.7 per square metre.

A
Rs.44,000
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B
Rs.4400
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C
Rs.440
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D
Rs.44
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Solution

## The correct option is B Rs.44,000Diameter of the pillar=50 mRadius=25 mHeight=4 m∴ Curved surface area of a pillar=2πrh=2×227×25×4 m2 Curved surface area of 10 pillars=2×227×25×4×10 m2 Cost of painting=Rs.7per sq.m∴ Total cost of painting 10 pillars=2×227×25×4×10×7=Rs.44,000

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