How to Write Test Cases for Mortgage Calculator
Introduction & Importance
Writing test cases for a mortgage calculator is crucial to ensure its accuracy and reliability. This guide will walk you through the process…
How to Use This Calculator
- Enter the loan amount, interest rate, and loan term.
- Click ‘Calculate’.
- View the results and chart below.
Formula & Methodology
The mortgage calculator uses the formula for monthly mortgage payments:
M = P [ i(1 + i)^n ] / [ (1 + i)^n — 1 ]
Where:
- M = monthly mortgage payment
- P = principal loan amount
- i = monthly interest rate
- n = number of months
Real-World Examples
Example 1
A $200,000 loan at 4% interest over 30 years…
Data & Statistics
| Interest Rate | Monthly Payment |
|---|---|
| 3% | $665.30 |
| 4% | $739.67 |
| 5% | $832.35 |
Expert Tips
- Always round to two decimal places.
- Consider using a financial calculator for complex scenarios.
Interactive FAQ
What is the difference between APR and interest rate?
APR includes additional fees and costs, while the interest rate is just the cost of borrowing money.