5. (20%) A company purchases an $80,000 mixer for use during the next 10 years. The mixer will have a salvage value of $20,000 at the end of 10 years, and the total amount of material to process is estimated at 2 million m'. The actual usages for year 1, 2-8, and 9-10 are 400,000, 200,000, and 100,000 m, respectively. (a) (5%) Compute the depreciation amount of the 3rd year using the units-of-production method. (b) (5%) Compute the depreciation amount of the 5th year using the sum-of-years digits method. (c)(5%) Compute the depreciation amount of the 7th year using the double declining balance method. (d) (5%) Compute the depreciation amount of the 9th year using the straight-line method. 000 now and S7000 ner