Business magnate Li Ka-shing had to quit school to help support his family
Net worth: $31 billion (as of March 2013)
Ka-shing fled mainland China for Hong Kong in 1940s. His father died when he was 15, leaving Ka-shing responsible for supporting his family. In 1950, he started his own company, Cheung Kong Industries, which initially produced plastics but later expand into real estate.
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