Elon Musk is now worth more than $300 billion, and he’s apparently ready to start spending.The Tesla and SpaceX CEO — whose net worth has ballooned by more than $140 billion this year, thanks largely to the skyrocketing value of his electric automaker — tweeted Sunday that he was willing to consider a proposal from a United Nations official who said that a $6 billion donation from one of the world’s wealthiest people could help stop world hunger.Last week, David Beasley, the director of the UN’s World Food Programme, told CNN that it was time for the ultra-wealthy to “step up now, on a one-time basis” in order to “help 42 million people that are literally going to die if we don’t reach them.” He specifically mentioned Musk and Amazon CEO Jeff Bezos, the two richest men in the world.On Sunday, Musk replied to a Twitter user who pointed out that $6 billion would be just 2% of his net worth. Musk said that if the WFP could describe “exactly” how the donation would solve world hunger, he would “sell Tesla stock right now and do it.”cnbc.com