Expenditures After Acquisition Roanoke Manufacturing placed a robotic arm on a large assembly machine on January 1 . At that time, the assembly machine was expected to last another 3 years. The following information is available concerning the assembly machine. The robotic arm cost $210,000 and was expected to extend the useful life of the machine by 3 years. Therefore, the usefut life of the assembly machine, after the arm replacement, is 6 years. The assembly machine is expected to have a residual value of $117,000 at the end of its useful lifet. 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. 2. Compute the revised amougt of depreciation expense for the machine using the straight-line mothod. 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 crecember 31