Part B: Rawalpindi Waste Management purchased new equipment on January 2, 1993, at a cost of 150000. The equipment had an estimated useful life of 6 years, with an estimated residual value of 15000. Instructions: Compute the annual depreciation expense throughout the 6-year life of this equipment under the two depreciation method listed below. Company policy is to round depreciation for fractional periods to the nearest month. As the equipment was acquired in early January, one full year's depreciation will be taken each year. a) Sum of year's digits b) Double declining balance