=IF(@Nationality="United Arab Emirates",0,IF(@Service_Days<365,0,IF(@Service_Days<1095,@Service_Days/365*@Basic_Salary/30*7,IF(@Service_Days<1825,@Service_Days/365*@Basic_Salary/30*21,(105*@Basic_Salary/30)+(@Service_Days-1825)/365*@Basic_Salary/30*30))))
