A fountain pen is bought in Rs. 20 . For how much it be sold so as to gain $10 \%$ ?
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A fountain pen is bought in Rs. 20 . For how much it be sold so as to gain $10 \%$ ?
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 Solution-

Let the C.P. $=$ Rs. 100

$

\begin{aligned}

\therefore \text { S.P. } &=100+10 \% \text { of } 100 \\

&=100+10=\text { Rs. } 110

\end{aligned}

$

$\because$ When the C.P. is Rs. 100 , then the S.P. = Rs. 110

$\therefore \quad$ When the C.P. is Re. 1 , then the

$

\text { S.P. }=\text { Rs. } \frac{110}{100}

$

$\therefore$ When the C.P. is Rs. 20 , then

$

\text { the S.P. }=\text { Rs. } \frac{110}{100} \times 20

$

$

\text { = Rs. } 22 \text {; Ans. }

$

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