This is one source although most estimates of the average I’ve seen are around this amount. According to one of the president’s budget proposal, (http://www.gpo.gov/fdsys/pkg/BUD...) in (very poorly run) Washington D.C. area schools, it costs around $18,000 per student, per school year for the “education” part of each child’s expenses, asking for a built-in 3.5% yearly budgetary increase.
Most of that amount goes to various democrat and union payoffs and salaries as evidenced by the conditions in the D.C. area schools.
Thanks for your reply here. Will take a look at it.