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Let's solve this problem step-by-step.

We are given:
- **Principal (p)**: 300 dollars
- **Interest rate (r)**: 3% per year → as a decimal, that is $ r = 0.03 $
- **Time (t)**: 5 years
- Formula for **simple interest**:  
  \[
  i = p \cdot r \cdot t
  \]

### Substituting the values:
\[
i = 300 \cdot 0.03 \cdot 5
\]

### Calculating:
\[
i = 300 \cdot 0.15 = 45
\]

So, the interest Maria will earn in 5 years is **$45**.

Would you like more details on how the formula works or have any further questions?  

Here are some related questions you might explore:
1. What will the total amount (principal + interest) be after 5 years?
2. How does compound interest differ from simple interest?
3. What would happen if the interest rate were increased to 5%?
4. How much interest would be earned in 10 years instead of 5?
5. What is the impact if interest is compounded annually rather than being simple?

**Tip:** Always convert percentages to decimals (e.g., 3% = 0.03) when using them in formulas!

Maria has $300 in a savings account. The interest rate is 3% per year and is not compounded. How much interest will she earn in 5 years?

Learn how to calculate the simple interest on a $300 savings account at a 3% annual interest rate over 5 years. This problem demonstrates basic percentage and interest calculation skills, suitable for Grade 6-8 students.

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