If the length of the rectangle increased by 40% and breadth is decreased by 40% what will be the change Percent in its perimeter
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1
Answer:
Correct option is
B
22% decrease
Let x be the length and y be breadth of the rectangle.
original area = xy
New area = x(1−
100
40
)×y(1+
100
30
)
=
5
3x
×
10
13y
=
50
39xy
Percentage change =
xy
(
50
39xy
−xy)
×100
= −22%
(- indicates that the area has decreased.)
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