a gain dealer cheats to the extent of 10 while buying..., Profit and Loss, General Mathematics

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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 %

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+ AnswerD

+ ExplanationWe know,  Gain % =  $(100 + commongain % )^2/100$  - 100

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

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

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