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Birgit Rausing

8,500,000,000 Dollars

(Net Worth: 8.5 Billion) 86 year old Birgit inherited the billions after the death of her husband Gad Rausing in 2000. In 1944 her father-in-law founded Tetra Pak which revolutionized the packaging of liquids (juices, milk etc) so Birgit has inherited a packaging giant Tetra Laval.