An annuity loan (installment credit) is repayed with constant monthly installments, which cover proportionate interest and part of the repayment. In order for the installment to stay constant over time, interest payments as a proportion of the loan decline while the amortization increases, until the loan is fully repaid. More detailed information on the calculation can be found in the following Wikipedia article: https://en.wikipedia.org/wiki/Annuity
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