Question:A gain dealer cheats to the extent of 10 % while buying as well as selling, by using false weights. His total gains is : 

A 10 % 
B 20 % 
C `22 2/9` % 
D 21 % 

+ Answer
D 

+ Explanation
We know,  Gain % = `(100 + commongain % )^2/100` - 100

Gain % = `((100 + 10 )^2/100 - 100)` %

= `((12100 -10000)/100)` % 
= 21 %

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Muhammad Abdullah Al Mamun

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