Question

1) Calcule as porcentagens:
A) 25% de 80 =
B) 12% de 150 =
C) 30% de 500 =
D) 5% de 200 =

Answer 1

Resposta:

a)20

b)18

c)150

d)10

Explicação passo-a-passo:

$a) \: \frac{25}{100} \times 80 = 25 \times 80 \div 100 = 20 \\ \\ b) \frac{12}{100} \times 150 = 12 \times 150 \div 100 = 18 \\ \\ c) \frac{30}{100} \times 500 = 30 \times 500 \div 100 = 150 \\ \\ d) \frac{5}{100} \times 200 = 200 \times 5 \div 100 = 10$

Answer 2

Resposta:

A)20

B)18

C)150

D)10

Explicação passo-a-passo:

A)

$a)25\%de80 \\ \frac{25}{100}.80 \\ cancelamento \: dos \: 0 \\ \\ \frac{25}{10} .8 \\ 25 \times 8 = \frac{200}{10} \\ cancelamento \\ \frac{20}{1} \\ \\ 20$

B)

$\frac{12}{100} .150 \\ \\ \frac{12}{10} .15 \\ 12 \times 15 = \frac{180}{10} \\ \frac{18}{1} \\ \\ 18$

C)

$\frac{30}{100} .500 \\ \frac{30}{1} .5 \\ 30 \times 5 = 150 \\ 150$

D)

$\frac{5}{100} .200 \\ \frac{5}{1}.2 \\ 5 \times 2 = 10 \\ 10$