25 Voltarin Co purchased a machine for $625,000 on November 2, 2019. The company expects the machine to last for 10 years or 50,000 hours of operation, with an estimated residual value of $15,000. During 2019 the computer was operated for 3,000 hours, while in 2020 it was operated for 2,600 hours. Calculate the depreciation expense for the computer for 2019 and 2020 using the following depreciation methods: (a) Straight-line (b) Double-declining-balance (c) Units-of-production