Cost of living in Arequipa (Peru) is 56% cheaper than in Aalborg (Denmark)
This comparison is lacking data. It provides a decent comparison, but it is not yet reliable. It is based on 258 prices entered by 22 different people.
For example, to keep the same standard of living that would require kr24,000 in Aalborg you would need to make just about kr10,446 (S/. 5,428) in Arequipa.