[XeTeX] %18 or 18% : incorrect placement of the percentage sign ?

[Steffen Wolfrum]

Hi,

I have often seen (in arabic newpapers) the percentage sign set left  
to the number "% 18".
Recently I read an article (http://sehstoerung.sonance.net/pdfs/ 
TitusNemeth_dissertation.pdf) that calls this "... the incorrect  
placement of the percentage sign".

Any native arabic speaker out there? Is it %18 or 18% ??


Thanks,

Steffen