A dishonest dealer professes to sell goods at the cost price but uses a weight of 880 grams per kg, what is his percent? Choose the correct choice
A) 15 % B) 13.6 % C) 65 % D) 45 % E) 35 %

Rationale: "explanation : 880 - - - 120 100 - - - ? = > 13.6 % answer : b"
Answer: B