Tandem Ltd purchased equipment on 1st January 2018 for S$299,000. The equipment was expected to have a useful life of 4 years or 34,250 operating hours, and a residual value of S$25,000. The equipment was used for 8,500 hours during 2018, 12100 hours in 2019, 10,400 hours in 2020 and 3,250 hours in2021. Determine the amount of depreciation expense for the years ended 31, 2018, 2019, 2020 and 2021 by using (i)Straight line method; and [4 marks] (ii) Units of Production [6 marks]