Cost of living in Rio de Janeiro (Brazil) is 29% 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 3,115 prices entered by 426 different people.
For example, to keep the same standard of living that would require €2,800 in Zaragoza you would need to make just about €1,976 (R$ 8,839) in Rio de Janeiro.