Question

By selling an article for Rs. 900; a man gains 20%. Find his cost price and the gain.

Answer 1

S.P. of an article = Rs. 900
Gain = 20%
C.P. = $\frac{100}{(100+Gain}\times$ S.P.
$\therefore C.P.=\frac{100}{(100+20)}\times Rs.900$
= Rs. $\frac{100}{120}\times 900=Rs.\frac{9000}{12}$
= Rs. 750
Gain = S.P. - C.P.
= Rs. 900- Rs.750 = Rs. 150