Debt is money owed by one party, the borrower or debtor, to a second party, the lender or creditor.
The annual interest rate, often called an annual percentage rate (APR) for this loan or line of credit.
How much faster you will get out of debt and how much interest you will save by adding an additional principal repayment to your next regularly scheduled payment.
Amount is invest in Arrears or in Advance. if it is in advance then calculate it's Compound Interest.