There is 10% increase in the length of a rectangle and 10% increase in the width of a rectangle. what is the percentage change in the area of the rectangle?

There is 10% increase in the length of a rectangle and 10% increase in the width of a rectangle. what is the percentage change in the area of the rectangle?

اگرمستطیل کی لمبائی میں 10% اور مستطیل کی چوڑائی میں 10% اضافہ ہو۔ تومستطیل کے احاطہ میں کتنےفیصد تبدیلیہوگی؟
Explanation

The old length and width are L and W.

The new length and width are (1.1)L and (1.1)W.


The old area is A = LW.

The new area is A = (1.1)L*(1.1)W = (1.21)LW

or an increase of 21%