Musk’s net worth rose by $24 billion to $335.1 billion Monday as the electric automaker’s shares jumped 8.5% in New York. Buffett, chairman of Berkshire Hathaway Inc., ranks 10th with a net worth of $104.1 billion. The value investor has donated a portion of his Berkshire stock every year to various charitable organizations, including the Bill & Melinda Gates Foundation. Buffett, 91, said in June that the value of his gifts over the past 16 years totaled $41 billion. Musk responded by saying he would sell Tesla stock worth $6 billion “right now” if the U.N. agency could outline how it would use the money to solve world hunger.