Subject :IMO Class : Class 8
What change in percent is made in the area of a rectangle, if length is decreased and breadth is increased by 5% ?
A2.5 % increase
B0.25 % increase
C0.25 % decrease
D2.5 % decrease
Ans 1:
Class : Class 9
Let the measure of the breadth =10
Let the measure of the length = 10
original area=10 x 10 =100
new length=9.5
new breadth=10.5
new area = (100-5)(100+5)/100
new area=99.75
percent change=100-99.75
=(0,25/100) x 100=0.25% decrease