Question

Ao vender um equipamento por R$ 4.255,00, um consultor de vendas lucra 15%. Qual o custo desse aparelho para o consultor?
A) R$ 3.000
B) R$ 3.200
C) R$ 3.500
D) R$ 3.700
E) R$ 4.000

Answer 1

Regra de 3 : 100% + 15% = 115%

$\mathtt{~~~~R\ ~~~~~~\%}} \\ \mathtt{~~4.255~~~115} \\ \mathtt{~~~~~x~~~~~~100} \\ \\ \mathtt{Multiplicar~cruzado} \\ \\ \mathtt{115x = 4.255~.~100} \\ \mathtt{115x =425.500 } \\ \mathtt{x = 425.500 \div 115} \\ \mathtt{x = 3.700} \\ \\ \\ \boxed{\boxed{\mathtt{Resposta: D)~R\ ~3.700,00}}}$

Answer 2

Regra de 3 : 100% + 15% = 115%

$\mathtt{~~~~R\ ~~~~~~\%}} \\ \mathtt{~~4.255~~~115} \\ \mathtt{~~~~~x~~~~~~100} \\ \\ \mathtt{Multiplicar~cruzado} \\ \\ \mathtt{115x = 4.255~.~100} \\ \mathtt{115x =425.500 } \\ \mathtt{x = 425.500 \div 115} \\ \mathtt{x = 3.700} \\ \\ \\ \boxed{\boxed{\mathtt{Resposta: D)~R\ ~3.700,00}}}$