If a length of a rectangle is increased by 30% and the width is decreased by 30%, then the area will be-
সমাধান
সঠিক উত্তর: Option A
Let, x = original width
and y = original length
Then, Area = xy
After change:
width = x - 0.30x = 0.70x
length = y + 0.30y = 1.30y
Then, Area = (0.70x)*(1.30y) = 0.91xy.
Change in area:
(xy - 0.91xy)
=0.09xy
Percent change in area:
(0.09xy)/xy *100
=0.09 * 100
=9% decrease in area.
