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Mathematics, 29.08.2020 23:01 kelseydavid69

John wants to purchase a smartphone at 40% discount from the marked (bar code) price. He walks into a store with a 20% off coupon. By what additional percent additional discount the price of the phone must be reduced (through negotiation) so that John, a math wiz, obtains a net discount of 40% from the marked price?

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