PVNa definition
PVNa. = percentage to be amortized; FVPk = present value factor, calculated according to the following formula, calculated to 9 (nine) decimal places, with rounding: NTNB = percentage rate per year, base 252 (two hundred and fifty-two) business days, of the National Treasury Note - Series B (NTNB), with duration closest to the Debentures on the date of the Optional Extraordinary Amortization, calculated 2 business days immediately preceding the date of Optional Extraordinary Amortization; nk = number of Business Days between the date of the Optional Extraordinary Amortization and the scheduled maturity date of each installment "k" falling due.