Question

The selling price of $15$ pens is equal to the cost price of $12$ pens. what is the loss percentage?

Answer 1

Let the CP of each pen be $Rs.1.$

Then,

CP of $15$ pens $=Rs.15$

SP of $15$ pens $=$ CP of $12$ pens $=Rs.12$ [$\because$ CP of $12$ pens $=Rs.12$]

now, Loss $=$ CP $-$ SP $=Rs.(15-12)=Rs.3$

Loss$\%=\frac{Loss}{CP}\times 100\%$

$=\frac{3}{15}\times 100\%=20\%$

Hence, the loss percent is $20\%.$