On October 1, 2018, Bricker Enterprises purchased and placed in service a machine that cost $200,000. The estimated service life is 10 years with a $20,000 residual value. Bricker records partial-year depreciation based on the number of months in servi rvice. Depreciation expense for 2018, using the straight-line method is Multiple Choice 4,500 18,000 13,500 None of the above 6,000