Copyright 2015 Bloomberg. NKI50T6TTDSK (Bloomberg) — Berkshire Hathaway Inc. said fourth-quarter profit slipped 17 percent as investment gains narrowed and underwriting results deteriorated at insurance units. Net income fell to $4.16 billion, or $2,529 per share, from $4.99 billion, or $3,035, a year earlier, Omaha, Nebraska-based Berkshire said Saturday in