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Explicación paso a paso:
Precio inicial: Pi=250
Precio final: Pf=212,50
Descuento: D
D = (Pi - Pf) / Pi • 100%
D = (250-212,50)/250 • 100%
D = 37,50/250 • 100%
D = 3750/250 %
D = 375/25 %
D = 15%