YOU SAID:

Now, what's the business?

INTO JAPANESE

さて、何の用事だ？

BACK INTO ENGLISH

Well, what business are you doing?

INTO JAPANESE

さて、何の事業をしているのですか？

BACK INTO ENGLISH

Well, what kind of business are you doing?

INTO JAPANESE

さて、どんな事業をしているのですか？

BACK INTO ENGLISH

Well, what kind of business are you doing?