General Motors will repurchase 200 million shares of its own stock currently held by the U.S. Treasury, with the White House announcing plans to sell off its remaining 300 million shares within the next 12 to 15 months. The automaker will pay $27.50 for the shares it will acquire, a 7.9% premium over the $25.49 closing price on December 18, 2012 – but that is also a sharp discount from the $33 price set during GM’s initial public offering in November 2010. And it means taxpayers will lose billions on the sale.