(1) An uncollected installment shall be added to the succeeding installment and, together with interest and penalties, shall be payable therewith.
(2) All assessments of $25 or more not paid before the certification of assessments unpaid to the clerk shall bear interest from the date of the warrant at the same rate as that specified for the bonds in the resolution of intention. The interest shall be payable on June 1 and December 1 of each year immediately before the interest becomes due on the bonds, but the governing body may provide a plan whereby the interest may be collected in partial payments prior to the date it becomes due.