Basic math skills are important. If you hire someone to handle your billing, make sure they understand their basic math.

in other words...

DON'T BE VERIZON!

http://www.boingboing.net/2009/03/19/verizon-doesnt-under.html

This is exactly why I believe that a passing grade in at least 1 year of a personal finance class should be required for graduation from high school.

Oh, and if there's anyone here who doesn't understand the difference between $.002 and ¢.002, I'd like to make an offer on your car.