A shopkeeper forced to sell at cost price, uses a 900 grams weight for a kilogram. What is his gain percent?  Choose the correct choice from the following choices.
A) 10%  B) 9%  C) 11.11%  D) 12 %  E) None of these
Shopkeeper sells 900g instead of 1000g.   So, his gain = 1000 - 900= 
<gadget id="calculator">1000 - 900</gadget>
<output>100</output>
100g.   Thus, %Gain= (100 *100)/900 = 11.11%.   answer : OPTION 11.11%
<result>C</result>
A shopkeeper forced to sell at cost price, uses a 900 grams weight for a kilogram. What is his gain percent?