Hi, I'm Jina! The last letter carries over to the next. So when you pronounce 102, it's [배기, bae-gi]. I hope it will help you (:

Okay, thank you so much!

Technically, Hanif is right. However, we tend to put a short break between 백 and 이, just to make it clear that we are speaking of a number, in situations where a number isn't exactly expected. And in that case, there is no carryover. It all depends on the context. Please note that Korean is way more context driven than western languages where the contents have the upper hand.

Thank you!

My understanding is that the sound carries over so that 백이 is pronounced as [배기]. Hopefully a native speaker can confirm :s