Digital BW, The Print

Tom, Did you ever have sg cartridges?  If so, Could you tell me
approximately how many 8x10 prints you could get out of a cartridge? 
Just roughly.  I've had 25 so far, but the cartridges have my old CIS
chips that tell the printer the cartridge is always full, so I don't
know how much ink is left.

Thanks.

Jerry