uma pessoa aplicou certa quantia em ações. no primeiro mês, ela perdeu 30% do total do investimento e, no segundo mês, recuperou 20% do que havia perdido. depois desses dois meses, resolveu tirar o montante de r$3.800,00 gerado pela aplicação.
Calculating the Initial Investment:
Question:
LectureNotes said uma pessoa aplicou certa quantia em ações. no primeiro mês, ela perdeu 30% do total do investimento e, no segundo mês, recuperou 20% do que havia perdido. depois desses dois meses, resolveu tirar o montante de r$3.800,00 gerado pela aplicação.
Answer:
Let’s assume the initially invested amount is $x.
-
In the first month:
- Lost 30% of the total investment:
$x - 0.30x = $0.70x left at the end of the first month.
- Lost 30% of the total investment:
-
In the second month:
- Recovered 20% of what was lost in the first month, which is 20% of 30%:
$0.70x + 0.20(0.30x) = $0.70x + $0.06x = $0.76x left at the end of the second month.
- Recovered 20% of what was lost in the first month, which is 20% of 30%:
Therefore, after two months, the person has $0.76x.
Given that the total amount withdrawn is $3,800, we can set up the equation:
$0.76x = $3,800
Now, we can solve for x:
$x = \frac{3800}{0.76} = $5,000
So, the initial investment amount was $5,000.