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Nigerian born tycoon Abdulsamad Rabiu joins the ranks of Africa's richest and the world's billionaires for the first time based on success at his BUA Group, whose biggest businesses are sugar refining and cement. BUA Group annual revenues are estimated at $2 billion. The group also does business in real estate, steel, port concessions, manufacturing, oil gas and shipping. Rabiu, the son of a businessman, set up his own business in 1988, importing rice, sugar and edible oils as well as iron and steel rods.