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80%=448
100%=x
regla de tres
80x=44800
x=560
$448.............80%
$ x................100%
OPERACION
448 * 100 : 80 = $ 560
VERIFICAMOS:
560 * 20 : 100 =
11200 : 100 = 112
560 - 112 = 448
RESPUESTA: El precio original de la mochila es de $ 560