A man buys milk at 6 per litre and adds one third of water to it and sells mixture at 7.20 per litre. The gain is Choose the correct choice from the following options
A) 40%  B) 80%  C) 60%  D) 25%  E) None of these
C.P. of one litre = 6   After adding water to it One has to pay 7.20 for 2⁄3 litre of milk.   So S.P. of 2⁄3 litre of milk = 7.20   ⇒ S.P. of 1 litre of milk = 7.20×3/2=10.80   ∵ S.P. &gt; C.P.   Hence gain = 10.80−6/6×100=4.80/6×100   = 0.80 × 100 = 80%   Answer 80%
<result>B</result>
A man buys milk at 6 per litre and adds one third of water to it and sells mixture at 7.20 per litre. The gain is