To convert the monthly interest rate to the Annual Percentage Rate (APR), we use the following formula:

$APR = \text{Monthly Rate} \times 12$

For a monthly interest rate of 2.25%, the calculation is:

$APR = 2.25 \times 12 = 27\%$

The APR is 27%.

Would you like further details or have any additional questions? Here are some related questions to explore:

1. How does APR differ from APY (Annual Percentage Yield)?
2. What impact does APR have on long-term loan costs?
3. Can we calculate effective annual interest rates from this APR?
4. What formulas can you use to compare different APR rates effectively?
5. How does compounding affect APR in credit card calculations?

Tip: Always check whether the APR includes any additional fees, as advertised APR might not reflect the true cost of credit!