Well i was wrong on my info. I was searching google for the total amount of sales for "get rich or die tryin" and i found this link. this is where i got that info from of him getting paid $5 per sale.
I quickly scanned the article and seen " get rich or die tryin" and $5 per sale at the bottom thats all i read
He got paid $5 per sale on his independant album "Guess whos back" Sold 202,000 copies and that article was in 2003.