Bill or cash memorandum to be issued to customer

A registered hotelier or restaurateur shall issue to the customer or customers a bill or cash memorandum serially numbered, signed and dated by him or his servant, manager or agent and showing therein such other particulars as may be prescribed. He shall keep a counterfoil or duplicate of such bill or cash memorandum duly signed and dated and preserve it for a period of not less than eight years from the date of the transaction.