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A book costs ₹400 and is marked at ₹500. What is the maximum discount the seller can offer while still breaking even (no loss)?
A$15\%$
B$20\%$
C$25\%$
D$30\%$
Answer & Solution
Correct answer: B. $20\%$
Break-even means SP = CP = ₹400. Discount needed = (500 − 400)/500 × 100 = 20%.
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