What does the phrase "You better believe it." mean in this conversation?

Helen: Last time I saw you, you were emptying a bedpan off a balcony.
Lucy: Yep. I was a maid and now I've got it made. Sorry.
Helen: Did you inherit everything?
Lucy: Everything.
Helen: How many years was it?
Lucy: I worked myself sick for 28 years.
Helen: How'd you do it? How'd you make it through?
Lucy: All I had to do was forget I was a person. You still working for Bitsy Brandenham?
Helen: You better believe it. I think we're in the home stretch.

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• Iniciante

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• Intermediário

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