Respostas

2014-04-29T16:34:43-03:00
B)

100%--------2000
1%------------- x

100x= 2000
2000/100= 20

71%-----------x
100%---------400
100x= 28400
28400/100= 284

C)
100%-------------400
1%----------------x

100x= 400
400/100= 4


35%---------------x
100%------------900

100x= 31500
31500/100= 315

A d tá incompleta.