A dishonest dealer professes to sell goods at the cost price but uses a weight of 700 grams per kg, what is his percent?  Choose the correct option:
A) 42.8 %	B) 25 %	C) 55 %	D) 28 %	E) 55 %

Rationale: "700 - - - 300 100 - - - ? = > 42.8 % answer : a"
Answer: A