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؟
Answer: 21%
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%
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