depends on which car you like. with 50,000 rials you can buy a luxury second hand car like BMW or JAGUAR of 1998 to 2002 model and at the same time you can get qatars alltime favorite cars like toyota camry, honda accord,nissan altima etc for 50,000 rial of 2004-2006 and still you can get the most economic and fuel efficient cars like toyota corolla ,nissan tida , honda civic etc of 2007-2008 and again you can buy cars like nissan sunny,honda city/jazz,toyota yaris etc for 50,000 which is of 2009 itself.

All the best........