Respostas

2014-08-05T15:08:56-03:00
320___________100%
x  _____________2,3%
100x=736
x=736/100
x=7,36
2014-08-05T15:09:19-03:00
2,3%
2,3 / 100 = 0,023
0,023 * 320 = 7,36

ou na calculadora:
320 * 2,3% = 7,36

ou na regra de 3:
320  -----------  100%
  x    -----------   2,3%
100x = 736
x= 736 / 100
x= 7,36