Question

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Answer 1

Explicação passo-a-passo:

1) 40 . 45 / 100 = 1800 / 100 = 18 alunos

2) 12/100 . 140 = 1680/100 = 16,8

140 - 16,8 = 123,2

custará R$ 123,2

3) 24 . 100 / 30 = 2400/30 = 80%

4) 15/100 .90 = 1350/100 = 13,50

custará 90 + 13,50 = 103,50