Shares of the technology giant jumped 5 percent to about $ 48 during after-hours trading as Tesla CEO Elon Musk stepped up efforts to buy the company. Last week, Musk stunned Wall Street and Silicon Valley when he attacked a group on social media with a takeover offer of £ 31 billion. The purpose of the takeover: Elon Musk (pictured) stunned Wall Street and Silicon Valley last week when he...