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7xddddddddddddf gycycgichcgcyv
200 zł - 40 zł = 160 zł -> spodnie
x -> cena kamizelki
160% x = 160 zł
1,6 x = 160 zł /:1,6
x = 100 zł
odp. Kamizelka kosztuje 100 zł.