source Forbes Bill Gates (60), Microsoft head although 4.2 billion poorer than 2015, his net worth of $75bn, is the world’s richest billionaire for the 17th time in 22 years, beating Mexico’s Carlos Slim Helu, who came fourth, behind Zara’s Amancio Ortega and Warren Buffet, according to Forbes’ annual ranking of billionaires. Other top ten include…
