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The price of a litre of petrol rose from ₹80 to ₹100. What is the percent increase?
A$20\%$
B$25\%$
C$80\%$
D$125\%$
Answer & Solution
Correct answer: B. $25\%$
Percent change = $(100 - 80)/80 \times 100\% = 20/80 \times 100\% = 25\%$. Using 100 as the base instead of 80 gives 20%, a classic SAT trap.
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