On August 1, 2017, UNC purchases a new boiler system. The total cost of the boiler is $19,500 including installation. The boiler is expected to last 15 years and have a salvage value of $1,500 when it is sold as scrap. Prepare the journal entry to record depreciation expense from the date of purchase through December 31, 2017 assuming UNC uses the straight-line method.