Question

Dupa o reducere de 20% pretul unui produs este 160lei . Aflati pretul initial.

Answer 1

[100-20]/100 ·y=160lei
⇒80/100 ·y=160
⇒y=160/80/100
⇒y=160·100/80
⇒y=2·100
⇒y=200[lei-pretul initial];

Answer 2

160...............80%
x,..................100%
x=160*100/80
x=200