Intel has announced plans to cut more than 15,000 jobs. The move is a bid to rejuvenate its business and keep pace with competitors – but has lead to shares in the tech titan plummeting by up to 20% following the announcement and the report of declining sales. Japanese tech firms were among the hardest hit, and the Nikkei ended the day down 2,216.63 points at 35,909.70. Worries over the US economy also contributed to the market downturn, fuelled by a grim audit of American manufacturing firms and forecasts of more job losses. Amazon’s shares fell more than 4 per cent after reporting a 10 per c…