Berkshire Corporation purchased a copying machine for $8,700 on January 1, 2019. The machine's residual value was $425 and its expected life was 5 years or 2,000,000 copies. Actual usage was 480,000 copies in the first year and 400,000 in the second year. Required: 1. Compute depreciation expense for 2019 and 2020 using the: a. Straight-line method. Depreciation expense $ per year b. Double-declining-balance method. Depreciation Expense 2019 2020 C. Units-of-production method. (Do not round intermediate calculations.) Depreciation Expense 2019 2020 2. For each depreciation method, what is the book value of the machine at the end of 2019? At the end of 2020? 2019 2020 a. Straight-line method A 6 b. Double-declining-balance method 4 c. Units-of-production method