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99zł-9,90zł=89.10zł
Odp. Musisz zapłacić 89.10zł
99 zł * 0,9 = 89,10 zł.
2 sposób:
99 - 100 %
x - 90% (bo o 10% nam obniżono)
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100x=99*90
x=99*90:100
x=8910:100
x=89,10