A shop owner professes to sell his articles at certain cost price but he uses false weights with which he cheats by 12% while buying and by 30% while selling. What is his percentage profit?  Select the correct option:
A) 10.22%  B) 20.22%  C) 21.22%  D) 60%  E) Can't be calculated
The owner buys 100 kg but actually gets 112kg;   The owner sells 100 kg but actually gives 70kg;   Profit:   (112-70)/70*100= 
<gadget id="calculator">  (112-70)/70*100</gadget>
<output>60</output>
~60%   Answer: 60%.
<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 12% while buying and by 30% while selling. What is his percentage profit?