Loan Calculator - Very Good, Cheap

1. Can calculate monthly payment, down payment, purchase price, yearly interest rate, total years to pay loan.
2. Prohibit illegal Input .
3. Prohibit mean-less input.
4. Big input button, easy to use.
5. Undo function.
6. Missing data reminding.
7. Wrong data format reminding.

Language: English, Chinese-implied, Chinese-traditional.

If you find a bug, please send all following info to my email address:
[email protected]. including the following message:

App name.
App version
Device name.
Device version.
Bug description.
Detailed procedure of how to re-produce the bug.
Thank you.