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?
LAT Past Papers / All — Multiple-choice practice
اگرمستطیل کی لمبائی میں 10% اور مستطیل کی چوڑائی میں 10% اضافہ ہو۔ تومستطیل کے احاطہ میں کتنےفیصد تبدیلیہوگی؟
- A. 23%
- B. 21%
- C. 10%
- D. 20%
Correct answer
21%
Explanation
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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