013, Powell Company purchased a building and machinery that have the following useful lives, salvage value, and costs. Building, 25-year estimated useful life. $9.000.000 cost, $900,000 salvage value Machinery, 10-year estimated useful life, $1,200,000 cost, no salvage value The building has been depreciated under the straight-line method through 2017. In 2018, the company decided to switch to the double-declining balance method of depreciation for the building. Powell also decided to change the total useful life of the machinery to 8 years, with a salvage value of $60,000 at the end of that time. The machinery is depreciated using the straight-line method. (a) Prepare the journal entry necessary to record the depreciation expense on the building in 2018. (b) Compute depreciation expense on the machinery for 2018