Question: Happy Birthday is a mixtape  that features a rapper who earned what in 2010?
Related documents: [0]  [DOC] DeAndre Cortez Way (born July 28, 1990), known professionally as Soulja Boy Tell 'Em, or simply Soulja Boy, is an American rapper, record producer, actor and entrepreneur. In September 2007, his debut single "Crank That (Soulja Boy)" peaked at number one on the U.S. "Billboard" Hot 100. The single was initially self-published to the internet, and later became a number-one hit in the United States for seven non-consecutive weeks starting in September 2007. On August 17, Way was listed at number 18 on the "Forbes" list of Hip-Hop Cash Kings of 2010 for earning $7 million for that year. [END] 
[1]  [DOC] Happy Birthday is the fourth mixtape released by British rapper Tinie Tempah. The mixtape was released for free download on December 16, 2011 on Disturbing London Records - featuring production from 3Mindz, S-X, Wizzy Wow and Stargate. The mixtape title is "Happy Birthday" because the mixtape came into production around Tempah's 23rd birthday (November 7). Tracks "Like It or Love It", "Lucky Cunt" and "Till I'm Gone (Remix)" were leaked prior to the mixtape release to create buzz, with "Like It or Love It" receiving minor radio airplay. "Happy Birthday" features British rappers Chipmunk, Giggs, Wretch 32, G-Frsh, Tinchy Stryder and Krept and Konan, including a variety of American rappers; Soulja Boy, J. Cole and Big Sean, along with Wiz Khalifa, Pusha T and Jim Jones on the "Till I'm Gone" remix (originally released on August 29, 2011). British vocalist J. Warner also makes a guest appearance. [END] 
Answer: 
$7 million
$7 million