Calculates the present value.

- a future value fv
- an interest rate compounded once per period - rate - enter as a decimal number, not percents
- total number of periods - nper
- a fixed payment amount - pmt
- when the fixed payment amount is paid - when - enter 0 when at the end of each period, enter 1 if at the beginning of each period

Negative numbers represents cash flow

**out**. See

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