US aluminium-maker Alcoa will cut 13 percent of its workforce, sell four of its non-core businesses, and impose a global salary and hiring freeze due to the economic slowdown.┬á "These are extraordinary times, requiring speed and decisiveness to address the current economic downturn," said Klaus Kleinfeld, AlcoaÔÇÖs president.┬á As part of the plan, Alcoa said it would sell off its electrical and electronic systems, global foil, cast car wheels, and European transport products businesses.