Question

Tres exemplos de porcentagem

Answer 1

40x = 100 * 30

40x = 3000

x = 3000
      40

x = 75%

100x = 95·105

100x = 9975

x = 9975
      100

x = 99,75 reais

70x = 21*100

70x = 2100

x = 2100
      70

x = 30