Armstrong Inc. is a calendar-year corporation. Its financial statements for the years ended 12/31/14 and 12/31/15 contained the following errors:

2014 2015

Ending inventory $25,000 overstatement $40,000 understatement

Depreciation expense 10,000 understatement 20,000 overstatement

Assume that no correcting entries were made at 12/31/14, or 12/31/15. Ignoring income taxes, by how much will retained earnings at 12/31/15 be overstated or understated?