SELECT Sum(MONTHLYSALARY) Department.city  

FROM Employee, Department  
WHERE (Employee.deptindex=Department.Pindex)  and (MONTHLYSALARY>=2000) 
 and ( 
 (Lastname LIKE 'Au%' )  OR  (Lastname LIKE 'Bac%' ) 
 ) 

 GROUP BY Department.city  
order by Department.city 