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Question

# If the cost price of 25 books is equal to the selling price of 20 books, then find the gain/loss percentage?

A
50%
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B
15%
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C
20%
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D
25%
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Solution

## The correct option is D 25%Let's suppose cost price of 1 book is x. ⇒ Cost price of 25 books =25×x=25x Given that cost price of 25 books is equal to selling price of 20 books. ⇒ Selling price of 1 book =25x20=5x4 And, as we can see that selling price is more than cost price because, 5x4>x [x>0] ⇒ Gain = 5x4−x=x4 ⇒ Gain percentage = GainCost Price×100%=x4x×100%⇒14×100%=25% Hence, option d is correct.

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