A dishonest dealer professes to sell goods at the cost price but uses a weight of 990 grams per kg, what is his percent? Choose the correct choice:
A) 1.01 %
B) 25 %
C) 22 %
D) 29 %
E) 45 %

Rationale: "990 - - - 10 100 - - - ? = > 1.01 % answer : a"
Answer: A