Where? Trenton? Newark?
What also factors in is how said tax money is used by school admins/board members. Using my cousin in another example; she teaches in an upper middle class area yet the board allocates more funding into sports programs than into actual education material. For perspective reasons, their computer lab consists of a bunch of beige boxes with a mixture of pentium II & III's running '98. Yet take a look at the sport teams' equipment, quite the contrast.
To top it off, they spend a decent amount on a program that takes some students from one of the poorer municipals (not based on any type of aptitude according to her) and allows them to attend the schools in [her] district. Want to bet which students she has more headache stories of? That fraction of $ should be used to improve the facilities.