Mathematics, 07.04.2021 17:40, quetzaliescalona

A store owner buys a case of 144 pens for $28.80. He sells the pens for $0.40 each. The owner claims that they marked the pens up by 50% before selling them. Prove that the owner calculated their markup correctly. If they did not, how much of a markup actually occurred?

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A store owner buys a case of 144 pens for $28.80. He sells the pens for $0.40 each. The owner claims...