A company purchased a piece of equipment for $50,000 and the equipment has an expected useful life of five years. Its residual value is estimated to be $4,000. Assuming the company uses the double-declining-balance depreciation method, what is the depreciation expense for the equipment for the second full year? A company purchased a tractor on January 1, 2021, for $65,000. The tractor's useful life is estimated to be 30,000 miles with an expected residual value of $5,000. If the company used the tractor 5,000 miles in 2021 and 3,000 miles in 2022, what is the balance for accumulated depreciation at the end of 2022 using the activity-based method