Elizabeth Warren challenges Bill Gates on 'wealth tax'

Democratic presidential hopeful Elizabeth Warren offered to meet Bill Gates after the Microsoft billionaire expressed skepticism about her proposal for a "wealth tax" affecting the richest Americans -- and assured him he would not have to pay $100 billion.Gates would pay $6.37 billion from a net worth of $107 billion, according to the calculator, slightly less than the $6.697 billion that would be owed by Amazon co-founder Jeff Bezos.