Hi, Can you please tell me how we get Deprection Expense Book Value in all 3 (Straight Line, Double Declining, and Units of Production) Thanks

On January 3, 2020, Xenex Innovations purchased computer equipment for $125,250. The equipment will be used in research and development activities for five years or a total of 8,500 hours and then sold for about $19,000. Prepare a schedule with headings as shown below. Calculate depreciation and book values for each year of the equipment's life for each method of depreciation. Xenex's year-end is December 31.

Units-of-Production Straight-Line Depreciation Book Value at Expense December 31 Double-Declining-Balance Depreciation Book Value at Expense December 31 Depreciation Expense Book Value at December 31 Year 2020 1,350 2021 1,780 2022 2,400 2023 2,980 2024 2,700