"Cảm ơn bạn rất nhiều!"

Translation: Thank you very much!

[atajk]

I got this in the numbers section

[JessicaN54279]

Why does Duolingo think that in English for "cam on ban rat nhieu" is "thanks very much"? I don't get this one at all. I never see people say that especially if it almost looks as if someone hasn't been ready to speak yet. I say, "Thank you very much!"