Question

If the length of the rectangle increased by 40% and breadth is decreased by 40% what will be the change Percent in its perimeter​

Answer 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.)