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The problem states:

An investor bought a batch of stocks for R$ 1,200.00. In the first month, the stock increased in value by 5%. In the second month, it increased again by 10%. After these two increases, the investor decided to sell the batch.

Let's calculate the selling price after these increases.

1. **Initial Purchase Price**: R$ 1,200.00
2. **First Month Increase**:
   - 5% of R$ 1,200.00 = $1,200 \times 0.05 = R$ 60$
   - New value after the first month = $1,200 + 60 = R$ 1,260$
3. **Second Month Increase**:
   - 10% of R$ 1,260 = $1,260 \times 0.10 = R$ 126$
   - New value after the second month = $1,260 + 126 = R$ 1,386$

Thus, the **selling price of the stock batch was R$ 1,386.00**.

Would you like further details or have any questions?

Here are 5 related questions to extend your understanding:
1. What would the final amount be if the increase percentages were reversed (10% first month, 5% second month)?
2. How would the calculation change if there was a third month with another increase?
3. What would the result be if one of the increases was a decrease instead?
4. How is the compounding effect demonstrated in this problem?
5. How would you calculate the percentage gain of the investment?

**Tip:** In percentage problems, multiplying sequentially by the percentage increases provides a compounded growth value.

Um investidor comprou um lote de ações na bolsa de valores por R$ 1.200,00. No primeiro mês, houve valorização do lote, e o valor aumentou em 5%. No segundo mês, houve um novo aumento de 10%. Após esses dois aumentos, o investidor resolveu vender o lote. O valor de venda do lote de ações foi

An investor bought stocks for R$ 1,200.00, with monthly increases of 5% and 10%. Learn how to calculate the final sale price, covering concepts like compound growth and percentage increase, suitable for Grades 7-9.

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