A firm purchased a three-year insurance policy for $13,500 on July 1, 2019. The $13,500 was debited to the Prepaid Insurance account. On December 1, 2019, a firm signed a contract with a local radio station for advertising that will extend over a two-year period. The firm paid $36,000 in advance and debited the amount to Prepaid Advertising. Prepare end-of-month adjusting entries for each of the above situations.