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x - 327zł
x = 100% x 327zł : 436zł
x = 75%
100% - 75% = 25%
Odp. Cenę obniżono o 25%.
109/436*100%=25%
a więc cenę obniżono o 25%
109: 436 = 0,25 *100% = 25 %
odp cene obniono o 25 %.