A tradesman by means of his false balance defrauds to the extent of 10%? in buying goods as well as by selling the goods. What percent does he gain on his outlay?  Choose the correct option: A) 29% B) 17% C) 44% D) 46% E) 21%
g% = 10 + 10 + (10*10)/100= 
<gadget id="calculator">10 + 10 + (10*10)/100</gadget>
<output>21</output>
21%   Answer: 21%
<result>E</result>
A tradesman by means of his false balance defrauds to the extent of 10%? in buying goods as well as by selling the goods. What percent does he gain on his outlay?