In recent years, Oriole Company has purchased three machines. Because of frequent employee turnover in the accounting department, a different accountant was in charge of selecting the depreciation method for each machine, and various methods have been used. Information concerning the machines is summarized in the table below. For the declining-balance method. Oriole Company uses the double-declining rate. For the units-of-activity method, total machine hours are expected to be 32,000. Actual hours of use in the first 3 years were: 2016, 680; 2017, 6, 400; and 2018, 7, 600. Compute the amount of accumulated depreciation on each machine at December 31, 2018