Respostas

2014-05-13T21:46:44-03:00
15% de 520 => 15x520/100 => 78 reprovados
2014-05-13T21:47:50-03:00
Qf = Qi x (1-i)
Qf = 520 x 1-0,15
Qf = 520 x 0,85
Qf = 442

Reprovados = 520 - 442 = 78 reprovados