The U.S Postal Service(USPS) delivers mail to 153 million addresses in every state, city and town in the country. In September 2017, a customer purchases a standard roll of 100 Forever stamps for $49 cash from USPS.The customer can use the Forever stamps at any time to mail a letter regardless of the current postal rate. The postal service estimates that 5% of forever stamps are never used. Indicate when the organization should record revenue and provide a reason for your answer.