PMT returns the amount of payment for a loan based on a constant interest rate and constant payments (each payment is equal amount). @rate is the constant interest rate. @nper is the overall number of payments. @pv is the present value. @fv is the future value. @type is the type of the payment: 0 means at the end of the period and 1 means at the beginning of the period.
If @fv is omitted, Gnumeric assumes it to be zero. If @type is omitted, Gnumeric assumes it to be zero.