Here's a link to Gamespot referencing the 28% increase. Again, these reports are not released to the public, but to institutional investors and certain media ;)
http://www.gamespot.com/news/6184692.html
Finally, you might want to redo your math.
3.75M units * 60 = 225M not $2.23B. You're thinking of 37.5M units. BTW, Halo 3 sold 3.3M it's first month.
Also, as a note, $2.3B is a monster record as NPD has NEVER been north of $2B in a month (prior to this one).
1
Here's a link to Gamespot referencing the 28% increase. Again, these reports are not released to the public, but to institutional investors and certain media ;)
http://www.gamespot.com/news/6184692.html
Finally, you might want to redo your math.
3.75M units * 60 = 225M not $2.23B. You're thinking of 37.5M units. BTW, Halo 3 sold 3.3M it's first month.
Also, as a note, $2.3B is a monster record as NPD has NEVER been north of $2B in a month (prior to this one).