NEW YORK (Reuters) - Berkshire Hathaway Inc., the holding company run by billionaire Warren Buffett, said on Saturday that quarterly profit surged 40 percent, helped by a $1.63 billion gain on a successful bet the U.S. dollar would fall. For the year, profit fell 10 percent. Buffett, in his annual letter to Berkshire shareholders, said he increased his stake in foreign currency contracts, and wants to deploy more of Berkshire's $43.4 billion of cash. Fourth-quarter net income for the Omaha, Nebraska-based company rose to $3.34 billion, or $2,172 per Class A share, from $2.39 billion, or $1,553 per share, a...