(Error and Change in Estimate—Depreciation) Joy Cunningham Co. purchased a machine on January 1, 2005, for $550,000. At that time it was estimated that the machine would have a 10-year life and no salvage value. On December 31, 2008, the firm’s accountant found that the entry for depreciation expense had been omitted in 2006. In addition, management has informed the accountant that the company plans to switch to straight-line depreciation, starting with the year 2008. At present, the company uses the sum-of-the-years’-digits method for depreciating equipment.

Instructions Prepare the general journal entries that should be made at December 31, 2008 to record these events.

(Ignore tax effects.)