Any cemetery authority maintaining an endowment care fund shall maintain a current accounting system in accordance with generally accepted accounting principles. The system shall track sales, receipts, and disbursements and include the following:

(1) An individual contract or agreement with each individual purchasing a right of interment with reference numbering.

(2) A record of:

(a) Payments received and the amount due or paid to the endowment care fund;

(b) Reconciliation of payments to and from the fund; and

(c) All supporting bank and investment statements.

(3) All records required to be maintained pursuant to this rule and Title 68 RCW, whether maintained manually or by computer, shall:

(a) Be retained and available for inspection for a period of seven years; and

(b) Be understandable to the cemetery board examiner or other persons reasonably having cause to access them.