I just found this article (old):

http://www.zdnet.com/zdhelp/stories/main/0,5594,2649757,00.html

If they are right, then HP is not so bad off. 800 pages per black
cartridge for a $37 cartridge works out to about 400 true useful pages a'
about 10 cents each. Not so bad. You would go through a 500 page pack of
paper on one cartridge and have some spare left (I assume heavy b/w
graphics like printed circuit boards with lots of black fill).

Peter

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