alleryA CAT QA word problem says 'the price was reduced from ₹100 to ₹85'. The percent change is:
A$+15\%$
B$-15\%$
C$-18\%$
D$+12\%$
Answer & Solution
Correct answer: B. $-15\%$
Percent change = (new − old)/old × 100 = (85 − 100)/100 × 100 = -15% (a decrease).
**Sign-error trap:** positive 15% would mean a rise to ₹115.
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