The definition for Loan Constant:
The yearly percentage of interest which remains the same over the life of an amortized loan, based on the monthly payment in relation to the principal originally loaned. For example: A $1000 loan at 9% interest for 20 years can be amortized at $9.00 per month. The constant interest rate is figured by finding one year's payments ($9.00 x 12 months = $108,00), and expressing this amount as a percentage of the principal originally borrowed (10.8% of $1000).
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