Standard American English: BAR-et (stress on the first syllable, "BAR")
Other Possible Pronunciations:
* BAR-it (with a short "i" sound)
* BA-ret (with stress on the second syllable)
* BA-rit (with stress on the second syllable and a short "i" sound)
It's best to check with the person who you're talking to or look up the pronunciation in a dictionary if you're unsure.