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As a Western analogy, GBP has similar levels of formality:

Reminbi ~= Pound Sterling

Yuan ~= Pound

Kuai ~= Quid

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Is quid really used in UK by 80-90% people? I thought it's very informal slang word (of some lower educated people), in China most of the people just use kuai (well I guess not bank tellers).
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> Is quid really used in UK by 80-90% people?

I deal with Brits on a daily basis.

I seldom hear them use the term "pound". Everyone says quid.

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Pretty much everyone uses it in informal settings in my experience.

In a professional environment, people usually say pound.

The distinction is context-based, not class- or education-based.

It's my understanding the same is the case for kuai vs yuan as well?

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