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Returns a Double specifying the interest payment for a given period of an annuity based on periodic, fixed payments and a fixed interest rate.
Function IPmt( _ ByVal Rate As Double, _ ByVal Per As Double, _ ByVal NPer As Double, _ ByVal PV As Double, _ Optional ByVal FV As Double = 0, _ Optional ByVal Due As DueDate = DueDate.EndOfPeriod _ ) As Double