How do you bring up the topic of salary during an interview?

How do you bring up the topic of salary during an interview?

I have another Bank Teller interview. However, this one unlike the other one's didn't include a set wage like the other two did. I completely forgot what I put down as salary expectation. However, I think I either put negotiable or 15< an hour. Anyway how have you gone about bringing up salary during the interview?

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