A shopkeeper sells his goods at cost price but uses a weight of 800 gm instead of kilogram weight. What is his profit percentage?	Choose the correct choice from the following options:
A) 25 % B) 18 % C) 20 % D) 40 % E) 45 %

Rationale: "100 ( 1000 - 800 ) / 800 = 25 % profit percentage = 25 % answer a"
Answer: A