A shop owner professes to sell his articles at certain cost price but he uses false weights with which he cheats by 20% while buying and by 20% while selling. What is his percentage profit?
Pick.
A) 10.22%  B) 20.22%  C) 21.22%  D) 50%  E) Can't be calculated
The owner buys 100 kg but actually gets 120kg;   The owner sells 100 kg but actually gives 80kg;   Profit:   (120-80)/80*100= 
<gadget id="calculator">  (120-80)/80*100</gadget>
<output>50</output>
~50%   Answer: 50%.
<result>D</result>
A shop owner professes to sell his articles at certain cost price but he uses false weights with which he cheats by 20% while buying and by 20% while selling. What is his percentage profit?