(1) After taxes are taken out she receives 2000-200=$1800 a month.
(2) Her weekly earnings are about 1800/4=$450 a week, where there are 4 working weeks in a month.
Taxes are relevant because they decrease earnings and are usually proportional to salary/wage. (Taxes go to the state or government to help pay for services provided by the state and national government for the benefit of the people).