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1-0,8 = 0,2 banany posostałe
424 * 0,8 /112% = 302,86 zł.
424*0,2 / 105% = 80,76 zł.
Cena zakupu bananów: 302,86 + 80,76 = 383,62 zł.
Sprawdzamy:
302,86 + 12% =339,20 zł.
80,76 + 5% = 84,80 zł.
339,20 + 84,80 = 424 zł.