Question

Um objeto foi vendido por RS 2 000, 00 com um lucro de RS 400, 00 sobre o preço de custo. Calcule a porcetagem desse lucro em relação ao preço de custo.​

Answer 1

$\begin{matrix} \underbrace{ \ REGRA \ \ DE \ \ TR\hat{E}S \ \ SIMPLES \ } \\\\\\ | \underline{~~~~~~~~~~~VALOR~~~~~~~~~~~~|~~~~~~~~PORCENTAGEM~~~~~~~~} | \\\\ | \underline{ ~~~~~~~~~~~~~ 2.000~~~~~~~~~~~~~~ | ~~~~~~~~~~~~~~~~~~~ 100~~~~~~~~~~~~~~~~~} | \\\\ | \underline{~~~~~~~~~~~~~400~~~~~~~~~~~~~~~~ |~~~~~~~~~~~~~~~~~~~~x~~~~~~~~~~~~~~~~~~} | \end{matrix}$  

$\\\\ \implies \ \ \ \dfrac{100}{x} \ \ = \ \ \dfrac{2.000}{400} \\\\\\ \implies \ \ \ 2.000x \ \ = \ \ 40.000 \\\\\\ \implies \ \ \ x \ \ = \ \ \dfrac{40.000}{2.000} \\\\\\ \implies \ \ \ x \ \ = \ \ \huge\boxed{ \boxed{ \ \ 20 \% \ \ } }$