Quick answer
A brand-wide percentage does not establish what your printer will cost to run. Compare compatible supplies, the same yield basis and the full pack price. We do not have a verified matched dataset supporting the earlier 50% claim in this URL. The URL is preserved; this guide replaces that conclusion with a calculation you can check.
Start with your exact printer
Record the printer model, supported supply numbers, cartridge or bottle format and color. A low price for an incompatible cartridge is not a saving. Check the manufacturer's compatibility documentation and the seller's warranty and return terms. OEM, remanufactured and third-party products should remain visibly distinct.
Match the denominator
Use the stated yield with its source and test conditions. Check whether it applies to one black cartridge, each color, a complete set or a multipack. Different black and color yields cannot be reduced to one pack-wide denominator without supporting evidence. Ink volume alone does not establish printed-page yield.
Work an example
An illustrative $30 cartridge with a documented 600-page yield costs $0.05 per claimed page. An illustrative compatible $24 cartridge with a documented 400-page yield costs $0.06 per claimed page. The cheaper cartridge price therefore has the higher unit cost in this example. These are examples, not tested performance or live offers.
If a four-bottle pack advertises separate black and color yields, keep those yields separate. Do not add them or multiply by the bottle count unless the source explicitly supports that interpretation. Your actual printed pages may differ from the source's stated test conditions.
Make the decision with the evidence visible
Write down the product model, supplier, pack contents, total price, yield source, compatibility, condition and offer date. Keep uncertain yield claims out of a value verdict until reviewed. Compare printer-ink offers, inspect each product's details and follow our methodology. Unit price helps compare accepted inputs; it does not prove equal print quality or reliability.
Correction note
No claim that HP or every alternative is always cheaper is made here. The original record remains available for correction history; future conclusions require exact compatible models and documented evidence.