В результате коммерческой деятельности

As a result of commercial activities in 2004, the company suffered a loss of 30 thousand rubles. In 2005 - profit of 25 thousand rubles. In 2006 - 40 thousand rubles were profitable. In 2007 - profit of 60 thousand rubles.
Determine the amount of tax base for income tax for 2005, 2006, 2007.

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