Question

If the SP of $5$ pens is equal to the CP of $4$ pens, find the gain $\%$ or loss $\%$?

• A. $30\%$ loss
• B. $20\%$ loss
• C. $25\%$ gain
• D. $15\%$ gain

Answer 1

The correct option is B $20\%$ loss

Let the CP of 4 pens be 4.
Then the SP of 5 pens will be 4.
SP of 1 pen will be $\frac{4}{5}$.
Loss on 1 pen $=1-\frac{4}{5}=\frac{1}{5}$
Loss percent $=\frac{1}{5}\times 100=20\%$