Calculate the present value of an investment based on a series of equal payments discounted at a periodic interest rate over the number of payment periods in the term.
Inbertsio baten uneko balioa kalkulatzen du; inbertsio hori pmt(e)ko ordainketa sail batek osatzen du, eta int(e) aldiaren interes-tasa kendu behar da ordainketa-aldi bakoitzean.