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The problem in the image is asking for the simple interest rate on a $1100 investment that pays $623.70 in interest over 13.5 years.

We can use the simple interest formula:

\[
I = P \times r \times t
\]

Where:
- $ I $ is the interest ($623.70),
- $ P $ is the principal amount ($1100),
- $ r $ is the simple interest rate (unknown),
- $ t $ is the time in years (13.5).

We want to solve for $ r $:

\[
r = \frac{I}{P \times t}
\]

Now, let's calculate the value of $ r $.The simple interest rate on the $1100 investment that pays $623.70 in interest over 13.5 years is **4.2%**.

Would you like further explanation or have any additional questions?

Here are 5 related questions you might find helpful:
1. How do you calculate total interest earned for different time periods?
2. What is the difference between simple interest and compound interest?
3. How does increasing the time affect the simple interest earned?
4. How can you adjust the formula for quarterly or monthly interest calculations?
5. What is the impact of the principal amount on the interest rate?

**Tip**: Always double-check if you are working with simple or compound interest, as it significantly changes the final amount!

What is the simple interest rate on a $1100 investment paying $623.70 interest in 13.5 years?

Learn how to calculate the simple interest rate for a $1100 investment that pays $623.70 in interest over 13.5 years. This problem involves key concepts in simple interest and algebra, suitable for students in Grades 9-12.

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