I want to buy a house that costs $300,000. Every month I can pay $800. The bank wants 5% interest per year, which is 5%/12 per month.

Interest is compounded monthly, not continuously. So don't use the mortgage formula, just compute the amount each month.

How much money will I owe after 10 years?

You get 10,000 points for computing the amount outstanding after each month.

You get 10,000 points for printing it to both the console window and the graphics window.

You get 5,000 points for having bigger numbers in a bigger font.

You get 5,000 points for making a graph of the outstanding balance.

Due Thursday Sep 10th.  -10% per day late (-30% max)