Google co-founder Sergey Brin has donated another $20 million to Build a Better California, an organization advocating against California’s proposed billionaire tax, according to a new filing . That means that the world’s fourth-richest man , whose net worth hovers around $267 billion, has now spent more than $100 million to avoid an estimated $13.3 billion tax payment. California’s Prop 40 , known as the billionaire tax, would impose a one-time 5% tax on the net worth of arou…
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