How would you solve this? They dont give you the cost

Use the Dynamic Exhibit to answer the following questions in year 3 under each depreciation method when residual value is $30,000 and useful life is 3 years: Straight-line Units-of Output Double-declining 2. Fill in the book value at the end of year 1 under each depreciation method when residual value is $36,000 and useful life is 4 years Depreciation method: Units of-Output 3. Move the Useful Life slider from 3 years to 4 years and complete the sentence. when the cost is spread over a longer useful life. Depreciation expense each year under every method is Use the Dynamic Exhibit to answer the following questions in year 3 under each depreciation method when residual value is $30,000 and useful life is 3 years: Straight-line Units-of Output Double-declining 2. Fill in the book value at the end of year 1 under each depreciation method when residual value is $36,000 and useful life is 4 years Depreciation method: Units of-Output 3. Move the Useful Life slider from 3 years to 4 years and complete the sentence. when the cost is spread over a longer useful life. Depreciation expense each year under every method is