Question

While selling a pen for $Rs24$, the loss percentage is equal to its cost price in rupees. find the cost price of the pen.

Answer 1

Let cost price be $x$

$\Rightarrow x-\frac{x}{100}\cdot x=24$

$\Rightarrow 100x-x^2=2400$

$\Rightarrow x^2-100x+2400=0$

$\Rightarrow (x-40)(x-60)=0$

So, $n=40or60$ Rs.