Respostas

2014-02-26T21:48:04-03:00
500x20=1000
1000/100=100
500-100=400
2014-02-26T21:48:13-03:00
20% = 20/100 = 0,2

20% de 500
0,2 x 500 = R$ 100

Valor R$ 500 - 100 = R$ 400 VALOR A VISTA