Question

1) Calcule as seguintes porcentagens:

a) 20% de R$ 1.400,00
b) 32% de R$ 4.200,00
c) 40% de R$ 7.500,00
d) 55% de R$ 8.840,00
e) 79% de R$ 12.000,00


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Answer 1

a) 100 - 1400

20 - x

100x = 20.1400

100x = 2800

x = 2800/100

x = 280

b) 100 - 4200

32 - x

100x = 32.4200

100x = 134.400

x = 134.400/100

x = 1344

c) 100 - 7500

40 - x

100x = 40.7500

100x = 300000

x = 300000/100

x = 3000

d) 100 - 8840

55 - x

100x = 55.8840

100x = 486200

x = 486200/100

x = 4862

e) 100 - 12000

79 - x

100x = 79.12000

100x = 948000

x = 948000/100

x = 9480