Neptune Company purchased a special purpose machine at a cost of $81,000 plus a provincial sales tax of $6,480. The machine was purchased on January 1, 2017 and is expected to have a residual value of $6,000 at the end of its service life. To assist in preparing the 2020 journal entries for depreciation of this machine, a junior accountant prepared the following schedule (Schedule No. 1 below): Schedule No. 1 Cost of machine Machine's residual value Years of service life Outputs in units S87,480 $6,000 4 2017 2018 2019 2020 1,400 1,300 1,000 1.100 4,800 Total output In addition, the junior accountant prepared a second schedule (Schedule No. 2 below) summarizing the amount of depreciation expense that would have been taken under three different depreciation methods since the January 1,2017 purchase date: Method 1 50% DDB Rate Schedule No. 2 Method 2 Units of Output Method 3 Straight-Line Year Depreciation Accumulated Depreciation Accumulated Depreciation Accumulated Expense Depreciation Expense Depreciation Expense Depreciation (rounded) 2017 $ 20,370.0 $ 20,370.0 $27,265 S27,265 $21,870 $21,870 2018 15,277.5 35,647.5 S25,318 S52,583 $21,870 S43,740 2019 11,458.1 47,105.6 $19,475 $72,058 $21,870 S65,610 2020 40.374.4 87,480.0 S21.422 S93,480 $21,870 S87,480 S87.480.0 $93.480 $87.480 You are now reviewing the second schedule prepared by the junior accountant and notice that a few errors were made in the calculations of annual depreciation expense under each of the three methods. Required: (a) Describe five (5) separate crrors made by the junior accountant in the calculation of depreciation expense under the three depreciation methods shown in Schedule No. 2. (5 marks) Recalculate the correct depreciation expense to be recorded under cach method for 2020. (7 marks) (b) (a) + Description of Error Error No. 1 Error No. 2 Error No. 3 Error No