(a) The board shall provide a finance ledger in which the assessor and collector shall be charged with the total assessment of property shown on the tax rolls.
(b) Credit shall be entered in the finance ledger of all collections paid to the depository.
(c) The finance ledger and the books and accounts of the assessor and collector shall be audited by the board semiannually on January 1 and July 1 of each year and at any other times ordered by the board.