Returns the number of periods for an investment based on periodic, constant payments and a constant interest rate.
The interest rate per period.
The payment made each period; it cannot change over the life of the annuity. Typically, pmt contains principal and interest but no other fees or taxes.
The present value, or the lump-sum amount that a series of future payments is worth right now.
The future value, or a cash balance you want to attain after the last payment is made. If fv is omitted, it is assumed to be BLANK.
The number 0 or 1 and indicates when payments are due. If type is omitted, it is assumed to be 0.
Contributors: Alberto Ferrari, Marco Russo
Microsoft documentation: https://support.microsoft.com/en-us/office/nper-function-240535b5-6653-4d2d-bfcf-b6a38151d815