Respostas

2014-04-25T15:12:07-03:00
A) 52 ---- 100%
     4 ------ x

52x = 400
x = 400/52
 x = 7,69 %


B) 52 ---- 100 %
     13 ---  x

52x= 1300
x = 1300/52
x= 25 %