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36zł=12%x
36=0,12x
x=36:0,12
x=300zł
x = 100%
korzystamy z proporcji
x/36zl = 100/12
x = 100/12 * 36zl = 8 1/3 * 36zl = 25/3 * 36zl = 25 * 12ZL = 300ZL
kOMPLET KSIAZEK KOSZTUJE 300 ZL.