How much is HK$ 400,000 equal to RMB?

What is the "big bag tutor" on the second floor? It is ridiculous to give a joke answer of "100 RMB = 106.35 Hong Kong dollars"! ! If you can really change it like this, I'll take all your money!

I went to Hong Kong only two months ago. There are many exchange points on the street, especially Causeway Bay. The conversion ratio ranges from 100 HK dollars to 104 RMB to 100 HK dollars to 105 RMB. Most exchange rates are 104. I converted it into HK$ 100 according to RMB 104.2.

If calculated according to the non-bank regular transaction 104.2/ 100, 420,000 Hong Kong dollars can be converted into 437,640 yuan. If it is converted according to formal channels, there is not so much, and it can only be converted according to the buying price of the bank on that day.

thank you