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x + 10%x - druga cena
x + 10%x = 1,1x
1,1x + 5% * 1,1x - końcowa cena
4,62 zł - końcowa cena
1,1x +5% * 1,1x = 1,155x
1,155 x = 4,62
x = 4,62 : 1,155
x=4
Odp.: Początkowa cena wynosiła 4 zł za litr.