a1=(FV at p1 - FV at p2) is the amount that the principal decreased between
start-period (p1) and end-period (p2).
a2=PMT * (p2 - p1) is the total payments made in that period.

=a2-a1 is the total interest charged over that period.

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Regards,
Fred


"melafont" wrote in
message ...

I was wanting a formula to return the cumulative interest paid between
two periods on a loan which has a residual value. Similar to CUMIPMT
but it does not factor in a residual value.


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melafont
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