Răspuns :
[tex]scumpirea : \frac{10}{100} *12 = 1,2~lei\\
pretul~final : 12 + 1,2 = 13, 2~lei[/tex]
[tex] \frac{10}{100}* 12= \frac{120}{100} = \frac{x}{y} \frac{12}{10} = 1,2 lei[/tex]
12+1,2=13,2 lei
12+1,2=13,2 lei