alleryThe 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 × 100 = 20/80 × 100 = 25%.
Using 100 (the new value) as the base would give 20%, a classic CAT trap.
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