Zhou canshengda traded in the old for the new?
It is not recommended that you change it in Beijing. Generally, there is a working fee for exchange in different places. Moreover, it seems that Beijing still implements the discount system, which is different from the business strategy in Southwest China. If the price is bought in Chengdu, it is more cost-effective to exchange it in Chengdu, otherwise the price will be chaotic, and if it is not good, it will be a loss.