Question

A student buys a pen for Rs. 90 and sells it for Rs. 100. Find his gain and gain percent.

Answer 1

C.P of a pen = Rs. 90
and S.P. = Rs. 100
$\therefore$ Gain = S.P - C.P = Rs. 100 - 90
$(\because S.P>C.P)$
= Rs. 10
$\therefore Gain\%=\frac{Gain\times 100}{C.P.}=\frac{10\times 100}{90}\%=\frac{100}{9}\%=11\frac{1}{9}\%$