https://www.nytimes.com/2017/09/28/business/dealbook/rovio-angry-birds-ipo.html?rref=collection%2fsectioncollection%2fbusiness&action=click&contentCollection=business®ion=rank&module=package&version=highlights&contentPlacement=1&pgtype=sectionfront

above is a link to a story about the IPO (Initial Public Offering) of Rovio Entertainment, the company behind "Angry Birds":

It is stated in the article that the company is valued at approximately $1 billion. Comment on what you think are the methods used to arrive at this estimate. What are your thoughts about how reasonable this estimate is?