Dear Saggi26,
thank you very much. I actually was thinking the other way around.

1. 1 QAR = 28.50 SLR (buying Rate)
2. 1 US$ = 113.5 SLR (buying Rate)

So if I can convert QAR to US$ free of charge as some one adviced me in one of this forums as possible in City Centre ( I may be badly adviced here). I will gain is'nt it.

Any way every thing depends on QAR to US$ conversion cost.

Thank you again for you advice . It has got me rethinking.