Adjusting for unearned revenues

a. Tao receives \($10,000\) cash in advance for 4 months of legal services on October 1, 2008, and records it by debiting Cash and crediting Unearned Revenue both for \($10,000\). It is now December 31, 2008, and Tao has provided legal services as planned. What adjusting entry should Tao make to account for the work performed from October 1 through December 31, 2008?
b. In June 2008, A. Caden started a new publication called Contest News. Her subscribers pay \($24\) to receive 12 issues. With every new subscriber, Caden debits Cash and credits Unearned Subscription Revenue for the amounts received. Caden has 100 new subscribers as of July 1, 2008. She sends Contest News to each of these subscribers every month from July through December. Assuming no changes in subscribers, prepare the journal entry that Caden must make as of December 31, 2008, to adjust the Subscription Revenue account and the Unearned Subscription Revenue account.