Joy Cunningham Co. purchased a machine on January 1, 2017, for $671,000. At that time, it was estimated that the machine would have a 10-year life and no residual value. On December 31, 2020, the firms accountant found that the entry for depreciation expense had been omitted in 2018. In addition, management has informed the accountant that the company plans to switch to straight-line depreciation because of a change in the pattern of the way the asset is used, starting with the year 2020. At present, the company uses the sum-of-the-years-digits method for depreciating equipment. Prepare the general journal entries that should be made at December 31, 2020, to record these events. Ignore income tax effects. (Credit account titles are automatically indented when the amount is entered. Do not indent manually. If no entry is required, select "No Entry" for the account titles and enter 0 for the amounts.)

Date	Account Titles and Explanation	Debit	Credit
Dec. 31	enter an account title to correct for the omission of depreciation expense in 2018 on December 31	enter a debit amount	enter a credit amount
	enter an account title to correct for the omission of depreciation expense in 2018 on December 31	enter a debit amount	enter a credit amount
	(To correct for the omission of depreciation expense in 2018)
Dec. 31	enter an account title to record depreciation expense for 2020 on December 31	enter a debit amount	enter a credit amount
	enter an account title to record depreciation expense for 2020 on December 31	enter a debit amount	enter a credit amount
	(To record depreciation expense for 2020)