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प्रश्न
A student buys a pen for Rs 90 and sells it for Rs 100. Find his gain and gain percent.
उत्तर
\[\text { C . P of pen = Rs } . 90\]
\[\text { S . P of pen = Rs . }100\]
Gain = SP - CP
Gain = 100 - 90
= Rs . 10
\[\text { Gain %} = \left( \frac{\text { gain } \times 100}{C . P .} \right)\]
\[ = \left( \frac{10 \times 100}{90} \right)\]
\[ = 11\frac{1}{9}\]%
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