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If on selling 15 books, a seller makes a profit equal to selling price of 3 books. Then gain % is:


1. 20% 
2. 25% 
3. 30% 
4. 15%

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Correct Answer - Option 2 : 25% 

Given

SP of 15 books - CP of 15 books = SP of 3 books

SP of 15 books - SP of 3 books = CP of 15 books

SP of 12 books = CP of 15 books

Formula 

%Profit = [(SP – CP)/CP] × 100

Calculation 

Let, CP of 1 book be X Rs.

Then CP of 12 books = 12X Rs.

And SP of 12 books = 15X

%Profit = [(15X – 12X)/12X] x100

⇒ (3/12) x 100

⇒ 25%

∴ Profit% in the given transaction is 25%

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