Q. A man buys a book for Rs. 110 and sells it for Rs. 123.20. Find his gain percent.
Answer: 12%
Notes: Since C.P=Rs. 110, S.P=Rs. 123.20 So gain = Rs.(123.20-110)=RS. 13.20 Therefore Gain Percent = $latex \left ( \frac{13.20}{110}\times 100 \right )&s=1$ %= $latex \frac{1320}{110}&s=1$ %=12%. Hence option [B] is the right answer.

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