[abclily]

$58,000.00 /180 days per year/8hrs. per day = $40.27 per hour. And the union dues are based on percentage of salary.

[leanoray]

Your calculations are embarrassingly primitive: Please check this reasoned defense for teachers making $90,000 per year. You may need to brush up on your calculus to understand it.
http://econlog.econlib.org/archives/2003/03/teacher_pay.html