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I obnizka- cena
0,9x
II obnizka -cena
0,9*0,9x=0.81x
0.81x=2430 |/0.81
x=3000 zł
to jest cena poczatkowa
x -100%
2430*100 243000
---------- = ---------=2700
90 90
2700 zł-90 %
x -100%
2700*100 270000
----------- = --------= 3000
90 90