Percentage by mass

A solid mixture contains sodium chloride and sodium nitrate. A 0.58g sample of the mixture was dissolved in water and made up to 250cm3
A 25cm3 portion was tut rated against silver nitrate solution of concentration 0.018 moldm3
The volume required was 27.3cm3
Calculate the percentage by mass of sodium chloride in the mixture

I got an answer of 4.97%
Please may you say if it is right or wrong.
If it is wrong, I’ll attach my workings out.
Thank you!!

A solid mixture contains sodium chloride and sodium nitrate. A 0.58g sample of the mixture was dissolved in water and made up to 250cm3
A 25cm3 portion was tut rated against silver nitrate solution of concentration 0.018 moldm3
The volume required was 27.3cm3
Calculate the percentage by mass of sodium chloride in the mixture

I got an answer of 4.97%
Please may you say if it is right or wrong.
If it is wrong, I’ll attach my workings out.
Thank you!!

I don’t agree with the final answer and I rather suspect it’s purely because you haven’t factored in that only 1/10 of the solution was used in the titration.