Cost of living in Avarua, Cook Islands (Cook Islands) is 113% more expensive than in Zhenjiang (China)
This comparison is lacking data. It provides a decent comparison, but it is not yet reliable. It is based on less than 10 prices entered by less than 5 different people.
For example, you would need at least 21,052元 (NZ$4,607) in Avarua, Cook Islands to maintain the same standard of living that you can have with 9,900元 in Zhenjiang.