Cost of living in Arequipa (Peru) is 60% cheaper than in Amsterdam (Netherlands)
This comparison is lacking data. It provides a decent comparison, but it is not yet reliable. It is based on 1,523 prices entered by 318 different people.
For example, to keep the same standard of living that would require €5,700 in Amsterdam you would need to make just about €2,256 (S/. 8,706) in Arequipa.