R.I. Gen. Laws § 11-9.1-1: Receipts for installment payments for merchandise.

Any person selling merchandise on the installment plan shall give to every purchaser of the merchandise on the plan a receipt in writing for every installment paid on account of the price of the merchandise, and every such receipt shall show the balance of the price remaining unpaid after giving credit for the payment. Any person violating any of the provisions of this section shall be fined twenty dollars ($20.00).