Respostas

2014-04-09T17:29:33-03:00
11 x R$3,80 = R$41,80
R$41,80 +R$7,20 =R$ 49,00

:))
2014-04-09T17:29:39-03:00
Irá pagar R$49,60
y=7,80+3,80x11