A single person can run his life here from 500 riyals/month to millions/month.
there r people eearning 500 but its damn too low for the current economy, 500 would be difficult to live with , maybe 1000 would do fine.
Formatted soul is rite there...it depends on what u eat , where u shop etc.
State ur job so the people can tell u whther 650 dollars is worth for ur job or u have to ask for more.