Expenditures After Acquisition machine. to have a residual value of $120,000 at the end of its useful life. Required: 1. Prepare the journal entry necessary to record the addition of the robotic arm. If an amount box does not require an entry, leave it blank. Jan. 1 2. Compute the revised amount of depreciation expense for the machine using the straight-line method. $ Prepare the necessary journal entry to record depreciation expense. If an amount box does not require an entry, leave it blank. Dec. 31 3. What is the book value of the machine at December 31 ? $