Cost of living in Banja Luka (Bosnia and Herzegovina) is 36% cheaper than in Zaragoza (Spain)
This comparison has some inconsistent or sparse data. It already provides a reliable comparison but it is not bullet-proof. It is based on 577 prices entered by 35 different people.
For example, to keep the same standard of living that would require €2,600 in Zaragoza you would need to make just about €1,662 (3,033KM) in Banja Luka.