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Question

There is a cylindrical platform of 2m radius 50cm height in school playground. What will be the cost of white washing the curved surface of this platform at the rate of Rs.12.5 per 100sq.cm(π=3.14)

Solution
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Given
r=200cm
h=50cm

circumference (c) =2πr

=2×3.14×200

=1256cm

cylinder surface area =c×h=1256×50

=62,800cm2

cost of whitewashing =628×100cm2

Given 12.5 per Rs-100sqcm

628×12.5=7,850 Rs.

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