Question : If the cost price of 20 books is the same as the selling price of 25 books, then the loss percentage is:
Option 1: 20%
Option 2: 25%
Option 3: 22%
Option 4: 24%
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Correct Answer: 20%
Solution : Let each book's cost price (CP) be Rs. $x$. Selling price (SP) of 25 books = CP of 20 books = Rs. 20$x$ CP of 25 books = Rs. 25$x$ ⇒ Loss on 25 books = 25$x$ – 20$x$ = Rs. 5$x$ So, loss % $=\frac{\text{Loss}}{\text{CP}} × 100 = \frac{5x}{25x} × 100 = 20\%$ Hence, the correct answer is 20%.
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