On April 1, 2009 Green Company received an advance payment of $60,000 from a customer. The payment was for five months of services Green would perform for the customer at the rate of $12,000 per month. Green started providing the service on April 1, 2009. On April 1, 2009 Green made an entry in its accounting system debiting Cash for $60,000 and crediting Unearned Service Revenue for $60,000. This is the only entry that has been made related to this transaction. Select the adjusting entry Green should make prior to preparing financial statements on April 30, 2009.