please show step by step solution

8) Assuming an asset is used evenly over a four-year service life and has no residual value, which method of depreciation will result in the highest depreciation in the first year? a) Straight line b) Sum of the year's digits c) Double declining d) Units of production 9) Archie Co. purchased a framing machine for $45,000 on January 1, 2018. The machine is expected to have a four-year life, with a residual value of $5,000 at the end of four years. Using the double-declining method, what would book value at December 31,2020 be