If a set of porcelain is sold for 80 yuan more than the cost price, it can earn 25%; after the actual sale, it loses 80 yuan. How much discount is this set of porcelain sold for?
一套瓷器，如果比成本价多80元出售，则可赚25%；实际卖出后，反而亏了80元，这套瓷器是打几折出售的？
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