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It should be formal. But what do I know :)
Between friends, it is often informal. For business, it should always be formal.
it is an informal group
formal is the cinema and informal is a gay man
It's both formal and informal. It depends on how you say it. If you say "Adiós, señora." it's formal. If you say "Adiós, amigo." it's informal.
informal
formal and informal rhythm
what is formal and informal communication
formal
There is no formal slang. Slang is informal language.
Formal is polite, informal is rude and obnoxious.
what is formal and informal shareholders agreement