Mortgage Repayment Formula Derivation - Mathshelper

The derivation for monthly repayments is very similar, except instead of DR 100 interest per yearwe have D× R 12 100 = DR 1200 per month. And instead of 25 or Y payments, we have 25×12 or 12Y payments. So Monthly Repayment = DR 1200 *.., 1+ R 1200 12Y 1+ R 1200 12Y −1 +/ /-So in our example of a £100,000 loan repayable over 25 years at 5% ... ................
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