Returns the payment on the principal for a given period for an investment based on periodic, constant payments and a constant interest rate.
 | Rate | is the interest rate per period. |
| Per | specifies the period and must be in the range 1 to nper. |
| Nper | is the total number of payment periods in an annuity. |
| Pv | is the present value — the total amount that a series of future payments is worth now. |
 | Fv | is 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 0 (zero), that is, the future value of a loan is 0. |
| Type | is the number 0 or 1 and indicates when payments are due. If type is omitted, it is assumed to be 0. |
