Question

A man bought two cows in Rs. 410 and sold each of them at the same price and thereby gained $15 \%$ on one and lost $10 \%$ on the other. What was the C.P. of each cow ?

Answer 1

Let the C.P. of first cow $=\mathrm{Rs} . x$

$\therefore \quad$ The C.P. of second cow

$

=\mathrm{Rs} \cdot(410-x)

$

From the question,

S.P. of first cow $=$ S.P. of second cow

$
\Rightarrow \frac{x \times(100+15)}{100}

$

$

=\frac{(410-x)(100-10)}{100}

$

$

\Rightarrow 115 x=(410-x) \times 90

$

$

\begin{array}{l}

\Rightarrow \quad 115 x=36900-90 x \\

\Rightarrow \quad 115 x+90 x=36900 \\

\Rightarrow \quad 205 x=36900

\end{array}

$

$

\therefore x=\frac{36900}{205}=180

$

$\therefore \quad$ C.P. of 2 nd cow $=410-180$

$

\text { =Rs. } 230

$

$\therefore$ Rs. 180 , and Rs. $230 ;$ Ans.