“How often do you have to replace the ink and what does it cost?”

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• The OfficeJet Pro 6978 printer uses the 902 ink cartridges. The black will yield up to 275 pages and the magenta/yellow/cyan will yield up to 275 pages. The 902XL cartridges will yield up to 825 for black and 825 for magenta/yellow/cyan. The 902 standard 4-pack is around $60 and the 902XL 4-pack is around $127.

  Answered by HP Team 3 years ago

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• Still on first cartridges. It depends on how often it is used.

  Answered by Steffi 3 years ago

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