OMAHA, Neb. (AP) — Berkshire Hathaway Inc.'s fourth quarter profit slid 17 percent because of declines in the paper value of its investments and derivative contracts. Warren Buffett's company released its latest results Saturday along with his letter to shareholders. Berkshire's quarterly net income declined to $4.16 billion, or $2,529 per Class A share, on $48.3 billion revenue.