The table below itemizes several assets. The company uses the double-declining-balance method to determine depreciation expense, which means that the rate used will be 2 divided by useful life.For example, if estimated useful life is 8 years, the declining balance rate would be 2 : 8, or 25%. Assume in all cases that the asset's first and last years are full years and that all assumptions and estimatesused to derive depreciation remain unchanged throughout the asset's useful lives. Data tableEstimated usefulEstimatedItemCostliferesidual valueLathe5,000,0007 years400,000Building30,000,00020 years800,000Earth-moving truck600,0006 years65,000Electric turbine7,000,00010 years800,000Stamping machine12,000,0009 years4,000,000 Requireda. Calculate depreciation expense for the first, third, fifth, and last years using the double-declining-balance method.b. Assume in all cases the asseis are sold at their estimated residual value. Prepare the journal entry to record their disposal