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⅘z 2000=1600kg
2000-1600=400kg
x=cena zakupu 1kg bananów
12%x×1600+5%x×400=424
0,12x×1600+0,05x×400=424
192x+20x=424
212x=424
x=424:212
x=2 zł = cena 1 kg zakupu
kupił bananów za 2×2000kg=4000zł