Businessweek He got 10 percent a year on a $5 billion preferred stake in Goldman Sachs and a $3 billion bet on General Electric Co. (GE:US) Both companies redeemed the investments at a premium. Berkshire later swapped warrants it got in those deals for common stock … Warren Buffett’s Latest Whopper of a Yield DealTheStreet.com Burger King signs deal to buy Tim Hortons for $12.5Bbnn.ca Burger King Worldwide Inc announces deal to buy Tim HortonsFinancial Post |