Moreno Company publishes a monthly sports magazine, Fishing Preview. Subscriptions to the magazine cost $20 per year. During November 2020, Moreno sells 15,000 subscriptions beginning with the December issue. Moreno prepares financial statements quarterly and recognizes subscription revenue at the end of the quarter. The company uses the accounts Unearned Subscription Revenue and Subscription Revenue.

Prepare the adjusting entry at December 31, 2020, to record sales revenue recognized in December 2020