(15 pts) Oak Service bought computer equipment for AED 22,000 on January 1, 2018. It has an estimated useful life of four years and zero residual value. Oakland uses the straight-line method to calculate depreciation and records depreciation expense in the Calculate the amount of Depreciation Expense for the 2018, for this equipment. AED . books at the end of each month. period,January 1, 2018 through September 30