Quantitative Aptitude • Percentage, Profit & LossMedium
The price of a water bottle is first increased by 30% and then decreased by 30%. What is the net change in its price?
A. 9% decrease✓ Correct Answer
B. No change
C. 9% increase
D. 30% decrease
💡 Solution & Explanation
Take the price as 100. After a 30% increase it becomes 130. A 30% decrease is taken on 130, which is 39, so the price becomes 91. That is 9 less than the start: a net decrease of 9%. Shortcut: an equal rise and fall of x% always gives a decrease of x²/100 %.
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