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Calculates the periodic amortisement for an investment with regular payments and a constant interest rate.

```
IPmt(Rate as Double, Per as Double, NPer as Double, PV as Double, [FV as Variant], [Due as Variant])
```

Double

Rate is the periodic interest rate.

Per is the period, for which the compound interest is calculated. Period=NPER if compound interest for the last period is calculated.

NPer is the total number of periods, during which annuity is paid.

PV is the present cash value in sequence of payments.

FV (optional) is the desired value (future value) at the end of the periods.

Due (optional) is the due date for the periodic payments.

0 - the payment is due at the end of the period;

1 - the payment is due at the beginning of the period.

```
Sub ExampleIPmt
Dim myIPmt As Double
myIPmt = IPmt(0.05,5,7,15000)
Print myIPmt ' returns -352.97 currency units. The compound interest during the fifth period (year) is 352.97 currency units.
End Sub
```