Conversation so far:
what's one of Rihanna's business endeavours?
Rihanna's first fragrance, "Reb'l Fleur", was released in January 2011.
how does the fragrance sell?
Reb'l Fleur was a financial success and was expected to gross US$80 million at retail by the end of 2011.
how did she get into selling fragrances?
CANNOTANSWER.

Question: what's another business endeavour?
Self-contained rewrite: Other than "Reb'l Fleur," what's another business endeavour of Rihanna's?