Shamrock Company is in the process of adjusting and correcting its books at the end of 2017. In reviewing its records, the following information is compiled. 1. Shamrock has failed to accrue sales commissions payable at the end of each of the last 2 years, as follows. December 31, 2016 $3,300 December 31, 2017 $2,300 2. In reviewing the December 31, 2017, inventory, Shamrock discovered errors in its inventory-taking procedures that have caused inventories for the last 3 years to be incorrect, as follows. December 31, 2015 Understated $16,700 December 31, 2016 Understated $19,000 December 31, 2017 Overstated $6,000 Shamrock has already made an entry that established the incorrect December 31, 2017, inventory amount. 3. At December 31, 2017, Shamrock decided to change the depreciation method on its office equipment from double-declining-balance to straight-line. The equipment had an original cost of $90,000 when purchased on January 1, 2015. It has a 10-year useful life and no salvage value. Depreciation expense recorded prior to 2017 under the double-declining-balance method was $39,600. Shamrock has already recorded 2017 depreciation expense of $11,600 using the double-declining-balance method. 4. Before 2017, Shamrock accounted for its income from long-term construction contracts on the completed-contract basis. Early in 2017, Shamrock changed to the percentage-of-completion basis for accounting purposes. It continues to use the completed-contract method for tax purposes. Income for 2017 has been recorded using the percentage-of-completion method. The following information is available. Pretax Income Percentage-of-Completion Completed-Contract Prior to 2017 $141,700 $94,900 2017 57,500 21,600 Prepare the journal entries necessary at December 31, 2017, to record the above corrections and changes. The books are still open for 2017. The income tax rate is 40%. Shamrock has not yet recorded its 2017 income tax expense and payable amounts so current-year tax effects may be ignored. Prior-year tax effects must be considered in item 4. (Credit account titles are automatically indented when 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.) No. Account Titles and Explanation Debit Credit 1. 2. 3. 4.