Dennis Van Tine/AP Berkshire Hathaway reported a 67% jump in second-quarter profit, boosted by a growing economy. Underwriting profit at the Geico auto insurance unit more than quintupled. Berkshire ended June with $111.1 billion of cash and equivalents, some of which Buffett could use to repurchase stock under a new policy giving him and Munger more freedom to buy back stock they considered undervalued.