.62% ( 7.62 % ) for the final 10 years . these debentures are redeemable in whole or in part at our option at any time . the redemption price is equal to the greater of 100% ( 100 % ) of the principal amount and accrued interest , or the sum of the present values of the remaining scheduled payout of principal and interest thereon discounted to the date of redemption ( at a benchmark treasury yield plus five basis points ) plus accrued interest