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A bookseller sells a book for Rs 100, gaining Rs 20. His gain per cent is
(a) 20%
(b) 25%
(c) 22%
(d) none of these

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Solution

$(b) 25 % CP = SP - Gain = Rs (100 - 20) = Rs 80 ∴ Gain percentage = (\frac{gain}{CP} \times 100) % = (\frac{20}{80} \times 100) % = 25 %$

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