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500=100%
x=10%
x=10%×500/100%
x=50
b)21% liczby 300
300=100%
x=21%
x=21×300/100%
x=63
c)75% liczby 120
120=100%
x=75%
x=120x75%/100%
x=90
d)90% liczby 80
80=100%
x=90%
x=90x80%/100%
x=72