Question

Find the $\text{C.P.}$, when:
(i) S.P. $=$ Rs. $12;\text{gain}=20\%$
(ii) S.P. $=$ Rs. $360;\text{loss}=10\%$

Answer 1

Let say $CP=x$

(1) $\therefore SP=CP+\frac{P}{100}\times CP$

$12=x+\frac{20}{100}\times x$

$12=x+\frac{x}{5}$

It gives: $x=10Rs$

$\therefore CP=10RS$

(2) Let say $CP=y$

$\therefore SP=CP-\frac{L}{100}\times CP$

$360=y-\frac{10}{100}\times y$

$360=y-\frac{y}{10}$

It gives $y=400Rs$

$\therefore CP=400Rs$