If a man buys 1 lt of milk for Rs.12 and mixes it with 20% water and sells it for Rs.15, then what is the percentage of gain?	Pick one
A) 25%  B) 28%  C) 29%  D) 50%  E) 55%
cp=1*12= 
<gadget id="calculator">1*12</gadget>
<output>12</output>
12   sp=1.2*15= 
<gadget id="calculator">1.2*15</gadget>
<output>18</output>
18   gain=sp-cp=6   gain%=(6/12)*100= 
<gadget id="calculator">(6/12)*100</gadget>
<output>50</output>
50%   ANSWER:50%
<result>D</result>
If a man buys 1 lt of milk for Rs.12 and mixes it with 20% water and sells it for Rs.15, then what is the percentage of gain?