The length of a rectangle isincreased by 30% and its width - ProProfs Discuss
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The length of a rectangle is increased by 30% and its width is decreased by 30%. What is the percentage change in its area?



A. No Change
B. Increased by 9%
C. Increased by 12%
D. Decreased by 12%
E. Decreased by 9%

This question is part of Mathematics Practice 1 - For SAT I, SHSAT & HS Entrance
Asked by JETSPEED, Last updated: Apr 02, 2020

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1 Answer

John Smith

John Smith

Answered Oct 11, 2016

Decreased by 9%

Method 1 % Changed = 100% - [(100+30)%][(100-30)%] = 100% - (130%)(70%) -- (13x7)% = 100% - 91% = 9% dropped Method 2 % decreased = 30% x 30% = 9%
 

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