A shop owner professes to sell his articles at certain cost price but he uses false weights with which he cheats by 10% while buying and by 20% while selling. What is his percentage profit?
Choose the most appropriate option:
A) 10.22%
B) 20.22%
C) 21.22%
D) 10%
E) Can't be calculated
The owner buys 100kg but actually gets 110kg;   The owner sells 100kg but actually gives 80kg;   Profit: (110-80)/80*100=10%   Answer: 10%.
<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 10% while buying and by 20% while selling. What is his percentage profit?