Wangerin Company is in the process of adjusting and correcting its books at the end of 2020. In reviewing its records, the following information was compiled.
1	At December 31, 2020, Wangerin decided to change the depreciation method on its office equipment double-declining-balance to straight line. The equipment had an original cost of $200,000 when purchased on January 1, 2018. It has a 10-year useful life and no salvage value. Depreciation expense recorded prior to 2020 under the double-declining balance method was $72,000. Wangerin has already recorded 2020 depreciation expense of $25,600 using the double-declining balance method.
2	Before 2020, Wangerin accounted for its income from long-term construction contracts on the completed-contract basis. Early in 2020, Wangerin changed to the percentage-of-completion basis for accounting purposes. It continues to use the completed-contract method for tax purposes. Income for 2020 has been recorded using the percentage-of-completion method. The following information is available:
3	Insurance for a 12-month period purchased on November 1 of this year was charged to insurance expense in the amount of $3,300 because "the amount of the check is about the same every year."
4	Reported sales revenue for the year is $1,908,000. This includes all sales taxes collected for the year. The sales tax rate is 6%. Because the sales tax is forwarded to the state's Department of Revenue, the Sales Tax Expense account is debited. The bookkeeper thought that "the sales tax is a selling expense". At the end of the current year, the balance in the Sales Tax Expense account is $103,400.
Instructions:
Prepare the journal entries necessary at December 31, 2020, to record the above corrections and changes. The books are still open for 2020. The income tax rate is 20%. Wangerin has not yet recorded its 2020 income tax expense and payable amounts so current-year tax effects may be ignored. Prior-year tax effects must be considered in item 2.

\begin{tabular}{lcc} & \multicolumn{2}{c}{ Pretax Income from } \\ \cline { 2 - 2 } & Percentage-of-Completion & Completed-Contract \\ Prior to 2020 & $450,000 & $315,000 \\ 2020 & 180,000 & 60,000 \end{tabular}