As used in this chapter:
(a) “Redemption amount” means the total amount which would be necessary to redeem the property from sale for delinquent assessments at the time election is made to pay delinquent assessments in installments under this chapter.
(b) “Balance of the redemption amount” is the amount equal to the difference between the redemption amount and the total of the portions previously paid which portions were paid as a part of the redemption amount.
(c) “Redemptioner” is the person whose estate has been sold, or his successor in interest.