Jan. 1 Mar. 1 Sept. 1 Purchased a copyright for $153,000. The copyright has a useful life of 6 years and a remaining legal life of 30 years. Purchased a patent with an estimated useful life of 4 years and a legal life of 20 years for $96,000. Purchased a small company and recorded goodwill of $183,000. Its useful life is indefinite. Prepare all adjusting entries at December 31 to record amortization required by the events. (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 O for the amounts.) Date Account Titles and Explanation Dec. 31 Amortization Expense Accumulated Depreciation-Plant Assets (To record amortization of Copyrights) Dec. 31 Amortization Expense Debit 25500 20000 Accumulated Depreciation-Plant Assets (To record amortization of Patents) Dec. 31 Amortization Expense 6100 Accumulated Depreciation-Buildings (To record amortization of Goodwill) Credit 25500 20000 6100