SSC CGL Tier II 1 Dec 2016 Paper 1

Question : 54 of 100

Marks: +1, -0

If the radius of a right circular cylinder open at both the ends, is decreased by 25% and the height of the cylinder is increased by 25%. Then the curved surface area of the cylinder thus formed

remains unaltered
is increased by 25%
is increased by 6.25%
is decreased by 6.25%

Validate

Solution:

(4) Effective percentage change

= (x+y+ {x y}/{100} ) \%

= (-25+25- {25× 25}/{100} ) \%

=-6.25 \%

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