i need help with these questions.

Compute depreciation on computer equipment costing $21,000 ($1,000 residual or salvage value) for each year of its 5 year life under the straight line method and under the double declining method. Please total the depreciation under each method. You may compute in Excel and copy your answer here. 19. What is the journal entry to record the asset? 20. What is the entry to record the first month (whole month) of depreciation on the straight line method? 21. What would the entry be to record the sale of the computer equipment after 40 months for $5,000 also using the straight line method