Bill Gates' former assistant is the world's 5th-richest person - and he's close to overtaking the Microsoft cofounder

Bill Gates' former assistant is the world's 5th-richest person - and he's close to overtaking the Microsoft cofounder

Steve Ballmer.Stephen Dunn/Getty Images <ul> <li>Bill Gates' ex-assistant could soon overtake the Microsoft cofounder and his former boss in wealth.</li> <li>Steve Ballmer's estimated $115 billion f… [+2540 chars]

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