$A$ dishonest trader professes to sell his article at cost price but he uses $900 \, g$ weight instead of $1 \, kg$. What is the percentage gain of the trader in this trade?
- A$\frac{80}{9} \%$
- B$\frac{100}{9} \%$
- C$\frac{110}{9} \%$
- D$\frac{70}{9} \%$
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