Consolidated debts.

(1) If debts arising from two or more retail installment sales other than sales pursuant to a revolving account are secured by more than one security interest, or consolidated into one debt payable on a single schedule of payments and the debt is secured by security interests taken with respect to one or more of the sales, payments received by the seller are deemed, for the purpose of determining the amount of the debt secured by the various security instruments, to have been first applied to the payment of the debt arising from the sale first made. To the extent debts are paid according to this section, security interests in items of property terminate as the debt originally incurred with respect to each item is paid.

(2) Payments received by the seller upon a revolving account are deemed, for the purpose of determining the amount of the debt secured by the various security interests, to have been applied first to the payment of credit service charges in the order of their entry to the account and then to the payment of debts in the order in which the entries to the account showing the debts were made.

(3) If the debts consolidated arose from two or more sales made on the same day, payments received by the seller are deemed, for the purpose of determining the amount of the debt secured by the various security interests, to have been applied first to the payment of the smallest debt.