Question

If the cost price of $30$ pens are equal to selling price of $24$ pens, calculate profit or loss (%)

Answer 1

Let the C.P be 'x' & S.P be 'y' then $30x=24y$ .........$\left(1\right)$

from $\left(1\right)$

$x<y\Rightarrow C.P<S.P$

$\therefore$ Gain

$\Rightarrow$ Gain$=\frac{S.P-C.P}{C.P}\times 100=\left(\frac{y-x}{x}\right)wg$

$\Rightarrow (\frac{y}{x}-1)100=(\frac{30}{24}-1)100$ (from $\left(1\right)$)

$\Rightarrow 25\%$.