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On January 3, 2020, Xenex Innovations purchased computer equipment for $165,250. The equipment will be used in research and development activities for five years or a total of 10,500 hours and then sold for about $34,000. Assume actual usage in hours of 2020 2,350 2021 1,980 2022 4,400 2023 3,180 2024 4,700 Required: Calculate depreciation expense and book values for each year of the equipment's life for each method of depreciation using the table provided below. Xenex's year-end is December 31. (Do not round intermediate calculations.) Straight-Line Depreciation Book Value at Expense December 31 Double-Declining-Balance Depreciation Book Value at Expense December 31 Units-of-Production Depreciation Book Value at Expense December 31 Year 2020 2021 2022 2023 2024