Respostas

2014-07-21T16:54:45-03:00
2500---80%
x-----100%

multiplica cruzado

R: 3126
1 1 1
2014-07-21T17:02:23-03:00

100-20=80
2500     80   
  X        100
2500*100/80=3125
A TV sem desconto custaria R$ 3.125,00