NEW YORK :Shares of both Apple and Amazon.com eased in after-hours trading on Thursday, with forecasts including Apple's estimated tariff costs disappointing investors after U.S. tech-related shares jumped earlier in the day. Apple's stock was down 4 per cent after the bell. While the company's results were better than analysts had expected, CEO Tim Cook said estimated tariffs will add about $900 million in costs to the quarter ending in June if rates do not change. Cook also outlined changes