[ \text{Percentual} = \left( \frac{\text{Número de comerciantes com CNPJ}}{\text{Total de comerciantes entrevistados}} \right) \times 100 ]

The formula provided calculates the percentage of merchants with a CNPJ (Cadastro Nacional da Pessoa Jurídica, a Brazilian national registry for companies) among the total number of merchants interviewed. 

Here’s a breakdown of the formula:

\[
\text{Percentage} = \left( \frac{\text{Number of merchants with CNPJ}}{\text{Total number of merchants interviewed}} \right) \times 100
\]

- **Number of merchants with CNPJ**: The count of merchants that have a registered CNPJ.
- **Total number of merchants interviewed**: The total number of merchants included in the survey or interview.
- The formula then multiplies by 100 to convert the result into a percentage.

Would you like to go into more detail or have any questions? 

Here are five questions related to the concept of percentage calculations:

1. How would you apply this formula if you had specific numbers for both merchants with CNPJ and the total merchants interviewed?
2. Can you explain the significance of using percentages in surveys?
3. How does increasing the total number of interviewed merchants affect the percentage?
4. What steps would you take to convert a percentage back into a decimal or fraction?
5. Why is it important to know the percentage of merchants with CNPJ in certain studies?

**Tip:** Always ensure that both the numerator and denominator in percentage calculations refer to quantities in the same category to avoid errors in interpretation.

Explore the percentage calculation formula and examples for determining the proportion of merchants with CNPJ among those interviewed. Learn the importance of percentages in surveys and practical applications.

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