jaki procent liczby 10 jest liczba 30
10--------100%
30-----------x
x= 30* 100
--------------
10
x= 300
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10--------100%
30-----------x
x= 30* 100
--------------
10
x= 300
ponieważ
10 - 100%
30 - x% mnożymy na krzyż
10x=100*30
10x=3000 /:10
x=300%