Question

Podemos afirmar que (30%).(30)% equivale a:
a) 600% b)9% c)90% c)900%

Answer 1

30% é representado por 
30/100 que será igual a 0,3 
se pegarmos esse 0,3 e multiplicarmos por 30 será igual a 9
0,3*30=9
alternativa B

(espero ter ajudado,bj!)

Answer 2

$30\%\cdot30\%=\dfrac{30}{100}\cdot\dfrac{30}{100}\\\\\\30\%\cdot30\%=\dfrac{3}{10}\cdot\dfrac{3}{10}\\\\\\30\%\cdot30\%=\dfrac{3\cdot3}{10\cdot10}\\\\\\30\%\cdot30\%=\dfrac{9}{100}\\\\\\30\%\cdot30\%=\dfrac{9}{100}\cdot100\%\\\\\\\boxed{\boxed{30\%\cdot30\%=9\%}}$