Bill and Melinda Gates have filed for divorce after 27 years of marriage. Here are details about their wealth and philanthropic activities.Bill GatesBill Gates is the world’s fourth-richest person with a net worth of US$130.5 billion, according to Forbes.Gates dropped out of Harvard University to co-found technology giant Microsoft with school friend Paul Allen in 1975. Gates owned 49 per cent of Microsoft at its initial public offering in 1986, which made him an instant multimillionaire.With…

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