1.

A bookseller sells a book for Rs. 100, gaining Rs. 20. His gain per cent is A. 20% B. 25% C. 22% D. none of these

Answer»

SP = Rs.100 

Gain = Rs.20 

CP = SP – Gain 

= 100 - 20 

= Rs.80

\(Gain\%=\frac{Gain\,\times\,100}{CP}\)

\(\frac{20\,\times\,100}{80}\)

= 25%



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