Question

Find the cost price, if:
$\left(i\right)$ S.P = Rs.$21$ and gain $=5\%$

Answer 1

(i) Given S.P $=Rs.21$ Gain $=5\%$

We know that,

$CP=\frac{100}{100+\text{Profit}\%}\times SP$

$=\frac{100}{105}\times 21$

$\therefore CP=Rs.20$