On January 1, 2018, Calloway Company leased a machine to Zone Corporation. The lease qualifies as a sales-type lease. Calloway paid $240,000 for the machine and is leasing it to Zone for $39,000 per year, an amount that will return 9% to Calloway. The present value of the lease payments is $240,000. The lease payments are due each January 1, beginning in 2018. What is the appropriate interest entry on December 31, 2018?