Tesla Motors Inc (NASDAQ:TSLA) founder Elon Musk’s net worth is just about to add another digit, reaching $9.7 billion after Tesla stocks jumped 12.6% after the car company impressed investors with its fourth quarter and full-year 2013 earnings, according to a Wealth-X report. Tesla Motors Inc (NASDAQ:TSLA) beat already optimistic expectations and said that it expects to sell 35,000 Model S sedans next year, and that it is ramping its production capacity up to 1,000 cars per week. While problems with battery production have delayed the launch of the luxury Model X until 2015, the setback wasn’t enough to hold back…