Question

Se R = 2% de 40%, o valor de 10% de R é igual a

a) 8%
b)80%
c)0,08%
d)0,8%
e)0,008%

Answer 1

De, na matemática, significa multiplicar,logo:
$2\% = \frac{2}{100} \\ 40\% = \frac{40}{100 } = \frac{4}{10 } \\ \frac{2}{100} \times \frac{4}{10} = \frac{8}{1000 } \\ 10\% = \frac{10}{100} = \frac{1}{10} \\ portanto \\ \frac{8}{1000} \times \frac{1}{10} = \frac{8}{10000} = \frac{8}{10000} \times 100\% = \frac{8}{100} = 0.08\%$
Letra C.
abraços.