"Yes, thank you very much."
Let's break it down:
* Hai (はい) means "yes."
* Arigatōgozaimashita (ありがとうございます) is the polite and formal way to say "thank you." It's used when expressing gratitude for something significant or when showing respect to the person you're thanking.
So, the entire phrase "Hai, arigatōgozaimashita" acknowledges the gratitude expressed and adds a formal "yes" for emphasis.