A shop owner professes to sell his articles at certain cost price but he uses false weights with which he cheats by 14% while buying and by 20% while selling. What is his percentage profit? Choose the correct option: A) 10.22 % B) 20.22 % C) 21.22 % D) 42.5 % E) ca n ' t be calculated

Rationale: the owner buys 100 kg but actually gets 114 kg ; the owner sells 100 kg but actually gives 80 kg ; profit : ( 114 - 80 ) / 80 * 100 = ~ 42.5 % answer : d .
Answer: D