Apple CEO Tim Cook, center, is surrounded by aides as finishes his appearance on Capitol Hill in Washington, Tuesday, May 21, 2013, before the Senate Homeland Security and Governmental Affairs Permanent subcommittee on Investigations as the panel examined the methods employed by multinational corporations to shift profits offshore and how such activities are affected by the Internal Revenue Code. Lawmakers pressed Cook to learn more about Apple's tax strategies in keeping a billion dollars in an Irish subsidiary, according to a report issued this week by the subcommittee. (AP Photo/J. Scott Applewhite)

Associated Press
Apple CEO Tim Cook, center, is surrounded by aides as finishes his appearance on Capitol Hill in Washington, Tuesday, May 21, 2013, before the Senate Homeland Security and Governmental Affairs Permanent subcommittee on Investigations as the panel examined the methods employed by multinational corporations to shift profits offshore and how such activities are affected by the Internal Revenue Code. Lawmakers pressed Cook to learn more about Apple's tax strategies in keeping a billion dollars in an Irish subsidiary, according to a report issued this week by the subcommittee. (AP Photo/J. Scott Applewhite)
Apple CEO Tim Cook, center, is surrounded by aides as finishes his appearance on Capitol Hill in Washington, Tuesday, May 21, 2013, before the Senate Homeland Security and Governmental Affairs Permanent subcommittee on Investigations as the panel examined the methods employed by multinational corporations to shift profits offshore and how such activities are affected by the Internal Revenue Code. Lawmakers pressed Cook to learn more about Apple's tax strategies in keeping a billion dollars in an Irish subsidiary, according to a report issued this week by the subcommittee. (AP Photo/J. Scott Applewhite)
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