A machine that produces cellphone components is purchased on January 1, 2020, for $181,000. It is expected to have a useful life of four years and a residual value of $12,000. The machine is expected to produce a total of 200,000 components during its life, distributed as follows: 40,000 in 2020, 50,000 in 2021, 60,000 in 2022, and 50,000 in 2023. The company has a December 31 year end.

Calculate the amount of depreciation to be charged each year, using each of the following methods:

i.	Straight-line method

ii.	Units-of-production method (Round depreciation per unit to 2 decimal places, e.g. 15.25 and final answer to 0 decimal places, e.g. 125.)

iii.	Double-diminishing-balance method

Which method results in the highest depreciation expense:

Straight-line method depreciation $ per year Units-of-production method depreciation $ per unit Year 2020 $ 2021 $ 2022 $ 2023 $ % Rate Year 2020 $ 2021 $ 2022 $ 2023 $ i. during the first two years? ii. over all four years