Question

1) calcular a porcentagem: a) 15% de 120 b) 25% de 400 c) 30 % de 150 d) 12% de 800 e) 40% de 50 f) 20% de 650 g) 15% de 250 Por favor preciso disso até 07:50​

Answer 1

Resposta:

a) 1,8

b) 100

c) 45

d) 96

e) 20

f) 130

g) 37,5

Explicação passo-a-passo:

a)

$\frac{15}{100} \times 12 = \frac{15 \times 12}{100} = \frac{180}{100} = \frac{18 \times 10}{10 \times 10} = \frac{18}{10} = 1.8$

b)

$\frac{25}{100} \times 400 = \frac{25 \times 4 \times 100}{100} = 25 \times 4 \times \frac{100}{100} = 100 \times 1 = 100$

c)

$\frac{30}{100} \times 150 = \frac{3 \times 10 \times 15 \times 10}{100} = \frac{3 \times 15 \times 100}{100} = 45 \times \frac{100}{100} = 45 \times 1 = 45$

d)

$\frac{12}{100} \times 800 = \frac{12 \times 8 \times 100}{100} = 96 \times \frac{100}{100} = 96 \times 1 = 96$

e)

$\frac{40}{100} \times 50 = \frac{4 \times 10 \times 5 \times 10}{100} = \frac{4 \times 5 \times 100}{100} = 20 \times \frac{100}{100} = 20 \times 1 = 20$

f)

$\frac{20}{100} \times 650 = \frac{2 \times 10 \times 65 \times 10}{100} = \frac{2 \times 65 \times 100}{100} = 130 \times \frac{100}{100} = 130 \times 1 = 130$

g)

$\frac{15}{100} \times 250 = \frac{15 \times 25 \times 10}{100} = \frac{375 \times 10}{10 \times 10} = \frac{375}{10} = 37.5$