Why do foreign hukou have to go to Xi 'an to buy a car in Xi 'an?

The mortgage must have a local license plate, probably because the local bank can find your car in this way. That's what the bank says. As for the residence permit, it is 1 000 yuan, which will definitely kill you. 750 yuan, the actual cost is about 1.6 yuan. Plus labor costs, it's almost 300 yuan. Most will kill you. I hope to adopt.