Question : By selling 100 notebooks, a shopkeeper gains the selling price of 20 notebooks. What is his gain percentage?
Option 1: 62.4%
Option 2: 22.5%
Option 3: 50.4%
Option 4: 25%
Correct Answer: 25%
Solution :
Given: By selling 100 notebooks, a shopkeeper gains the selling price of 20 notebooks.
Use the formula, Profit = SP – CP where SP is the selling price and CP is the cost price.
Let the CP of the notebook be INR $x$.
According to the question,
The CP of the 80 notebooks = $80x$
The SP of the 80 notebooks = $100x$
Profit = $100x–80x=20x$
The profit percentage = $\frac{20x}{80x}\times 100=25$%
Hence, the correct answer is 25%.
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