A man bought a book for Rs.450 and sold for Rs.495. Find the gain percent.

$\par S.P. = 495$ $\par C.P. = 450$

$\par Gain = 495 - 450 = 45$ $\lbrack gain = S.P - C.P.\rbrack$

$\par Gain$ % $=\frac{45}{450}$ $\times $ 100 = 10$ $\par \lbrack gain$ % $= \frac{Gain}{C.P.} \times 100\rbrack$

$\par \therefore$ gain$ % $= 10$

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