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x + 25%x - cena w sklepie
x + 0.25x = 1200
1.25x = 1200 / 1.25
x = 960
koszt w sklepie - s + 0,25
s+0,25s= 1200
czyli 1,25 - 1200 /:1,25
s=960
x + 25%x - cena w sklepie
x + 0.25x = 1200
1.25x = 1200 / 1.25
x = 960
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