Question

3. Calcule
a) 10 % de RS 350,00
b) 3.5 % de R$ 4 000,00.​

Answer 1

Bom Dia !!!

$a) \Rightarrow Devemos\ igualar\ 350\ igual\ a\ 100\ e\ aplicar\ a\ regra\ de\ 3: \\\\\hookrightarrow \frac{350}{x} = \frac{100}{10} \\\\\Rightarrow Multiplicando\ cruzado\Downarrow\ :\\\\100x = 3.500\\\\x = \frac{3.500}{100} \\\\{\small{\boxed{\boxed{\boxed{\sf x = 35 {\checkmark}}}}$

$b) \Rightarrow Seguimos\ o\ modelo\ anterior:\\\\\frac{4.000}{x} = \frac{100}{3,5} \\\\100x = 14.000\\\\x = \frac{14.000}{100} \\\\ {\small{\boxed{\boxed{\boxed{\boxed {\sf x = 140\checkmark}}}}$

Espero ter ajudado :-)

Att: LDC