I am looking for help to design a spreadsheet for a payment stream where interest-only payments are made for three months and Principal & Interest payments are made for nine months. The original amortization is 240 months and when the P &I payments are calculated they are based on the number of payments remaining. After Payment 1 is made there are 239 left, etc so the first P&I payment will be based on 237 payments remaining, etc.
Thanks in advance for your help.
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