[tex]\text{Detal = Brutto + VAT}\\\\\text{Brutto = Netto + Narzut}\\\\\text{VAT = Brutto * Stawka VAT}\\\\Netto = 10zl\\Narzut=10zl*25\%=10zl*\frac14=2.50zl\\Brutto=10zl+2.5zl=12.50zl\\Stawka \text{ }VAT=8\%\\VAT=12.50zl*8\%=12.50zl*\frac{8}{100}=1zl\\Detal=12.50zl+1zl=13.50zl[/tex]
Odp. Cena detaliczna soku wynosi 13.50zl