The length of a rectangle is decreased by 10% and its
The length of a rectangle is decreased by 10% and its breadth is increased by 10%. By what percent is its area changed?
A0%
B1%
C5%
D100%
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Answer is : 1%
Explanation:
When there is an increase in sides of a figure, the net increase in its area is
=x+y+xy100%
where x and y are length and breadth
given, length x decreased by 10. so, x = -10.
breadth y increased by 10. so, y = 10.
percent is its area changed
=−10+10+−10×10100%=−1%∴ percent of area decresed by 1%
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