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2540+685,80=3225,80 zl nowa cena
p - wysokośc obniżki , ulamek
3225,80 -p*3225,8=2540
-3225,8p=2540-3225,8
-3225,8p=-685,80
p=-685,80/(-3225,8)
p≈0,2126
100%*0,2126≈21,26%