September 2018 2 18 Report

Cene ksiazki podwyzszono o 25% i obecnie kosztuje ona 50zł. O ile procent nalezy obnizyc nowa cene aby otrzymac cene poczatkowa?

a. o 25% b. o 5% c. o 20% d.o 10%

I wyjasnij dlaczego?


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