An estimate of how much your printer and printer cartridge purchases will combine in costs in a year, here’s what you do. Multiply the number of pages you printer per week by 52 to get a year’s sum. Divide that figure with the cartridge page yield to find out the number of cartridges you will need per year. If you print, say, 25 pages in a week, you will end up printing 1300 pages in a year. If your printer cartridge is rated to print 200 copies, you’d need to buy 7 cartridges per year to print 1300 pages. So you won’t have to keep buying expensive original cartridges, you can switch to compatible ink jet cartridges.

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