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To determine the simple interest rate she was charged, we need additional information about either the total interest paid or the total amount (principal + interest) after 4 years. 

The formula for calculating simple interest is:
\[
I = P \times R \times T
\]
where:
- \( I \) is the interest,
- \( P \) is the principal (initial loan amount, which is \( \text{₱3,200} \)),
- \( R \) is the rate of interest per year,
- \( T \) is the time period in years (4 years in this case).

Without the interest amount \( I \), we cannot solve for \( R \) directly. If you can provide the total interest paid or the final amount after 4 years, I can calculate the interest rate. 

Would you like help with a similar example, or do you have additional information? 

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Here are some additional questions to explore this topic further:
1. What is the simple interest formula, and how is it applied in different scenarios?
2. How would the calculation change if the interest rate were compounded annually instead of being simple?
3. What factors influence the interest rate that banks charge for loans?
4. How can understanding interest rates help individuals make better financial decisions?
5. What are some examples of simple interest in real-life financial scenarios?

**Tip:** When dealing with interest problems, always check if the information provided involves simple or compound interest, as calculations differ between the two.

To start a mobile dog-grooming service, a woman borrowed ₱3,200. If the loan was for 4 years, what simple interest rate was she charged?

Find out how to determine the simple interest rate for a ₱3,200 loan over a period of 4 years. This problem involves basic algebra concepts and the simple interest formula, ideal for students in Grades 7-9.

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