A machine that produces cellphone components is purchased on January 1,2020 , for $171,000. 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. (a) Calculate the amount of depreciation to be charged each year, using each of the following methods: i. Straight-line method Straight-line method depreciation $ per year ii. Units-of-production method (Round depreciation per unit to 3 decimal places, e.g. 15.252 and final answer to 0 decimal places, eg. 125.) Units-of-production method depreciation $ per unit Year 2020$ 2021$ 2022$ 2023$ iii. Double-diminishing-balance method Rate %