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In a particular country in 1999, the average worker had to work 20 hours to produce 55 units of output. In that same country in 2009, the average worker needed to work 28 hours to produce 77 units of output. In that country, the productivity of the average worker1)decreased by 3 percent between 1999 and 2009.2)increased by 2 percent between 1999 and 2009.3)remained unchanged between 1999 and 2009.4)increased by 5 percent between 1999 and 2009.

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