Angular, HTML, CSS, Angular form template driven, custom directive

What are you most proud of, and what would you do differently next time?

It was nice challenge.

What challenges did you encounter, and how did you overcome them?

For me it was quit difficult to make 1st method work for big numbers. I don't know maybe it's JS fault for big numbers Math.pow() can't handle operations. so the mortgage number for the first method was NaN this is only issue I couldn't solve and handle.