An asset is purchased for $20,000. If it has a useful life of 10 years and salvage value of $5000. a) Use the DB and DDB methods to determine: the depreciation charges and book values for years 2, 4, 9, 10. b) What is the implied salvage value for the DDB method? (Show all your work please not using spreadsheet) Explain how to use DB and DDB methods clearly.