Respostas

2014-04-29T17:42:59-03:00
Regra de 3 :

100%-----------------4000 $
5 %------------------- x

100x= 4000 x 5
100x= 20000
20000/100= 200 $
2014-04-29T17:43:37-03:00
100%=4000
10%=4000/10=400
5%=400/2=200