The World's Billionaires

Columns: No | Name | Net worth ( USD ) | Age | Nationality | Source ( s ) of wealth
1 | Bill Gates | $ 40.0 billion | 53 | United States | Microsoft | 2 | Warren Buffett | $ 37.0 billion | 78 | United States | Berkshire Hathaway | 3 | Carlos Slim | $ 35.0 billion | 69 | Mexico | América Móvil , Grupo Carso | 4 | Larry Ellison | $ 22.5 billion | 64 | United States | Oracle Corporation | 5 | Ingvar Kamprad | $ 22.0 billion | 83 | Sweden | IKEA | 6 | Karl Albrecht | $ 21.5 billion | 89 | Germany | Aldi Süd | 7 | Mukesh Ambani | $ 19.5 billion | 52 | India | Reliance Industries | 8 | Lakshmi Mittal | $ 19.3 billion | 58 | India | Arcelor Mittal | 9 | Theo Albrecht | $ 18.8 billion | 87 | Germany | Aldi Nord , Trader Joe 's | 10 | Amancio Ortega | $ 18.3 billion | 73 | Spain | Inditex Group

Example questions:
In what ranking on the list of top 10 billionaires in 2009 is the American business magnate , investor and philanthropist who also graduated from Columbia Business School ? | The oldest individual on the list of the 2009 World 's top billionaires was named the ____ richest individual in the world in 2014. ? | What multinational retail company did the individual who was on the list of 10 richest billionaires in 2009 with a networth of $ 22.0 billion found ? | What ranking of the person on the top 10 2009 billionaires list who held the title of `` the richest Asian in Europe '' in 2007 ?

Answers:
2 | 21st-richest | Ikea | 8