A shopkeeper cheats to the extent of 10% while buying and selling, by using false weights. His total gain is. Choose the correct choice: A) 20% B) 21% C) 22% D) 23% E) 24%
Explanation:   Gain%=((100+common gain%)2/ 100−100)%   =((100+10)2/ 100−100)%   =(12100−10000/ 100)%=21%   Option 21%
<result>B</result>
A shopkeeper cheats to the extent of 10% while buying and selling, by using false weights. His total gain is.