Răspuns :
[tex]245 - \frac{20}{100} * 245 = 245 -\frac{1}{5} * 245 = 245-49=196[/tex]
245 lei.......... 100%
x lei............... 80%
____________________
x=245x80/100
x=196 lei
x lei............... 80%
____________________
x=245x80/100
x=196 lei