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o ile % obniżono: p/100
o ile obniżono: px/100
nowa cena: x - px/100
x/(x - px/100) *100% =
= x * 1/x(1-p/100) *100 =
= 100/(1-p/100)
odp. Trzeba podwyższyć o 100/(1-p/100) %