please show me how to do this problem with steps.

A metal fabrication machine can be purchased and installed for $60000 is expected to be kept in service for 20 years. The salvage value of the machine is estimated to be $15000. If using the classical 150% DB with a switchover to SL method to depreciate the asset, please answer the following questions. a) How many years can this asset be depreciated (the value of N used in depreciation calculation)? b) What would be the beginning-year BV for year 3? c) In the DB with switchover to SL table, what would be the depreciation amount in year 3 if using the 150% DB method in year 3 ? d) In the DB with switchover to SL table, what would be the depreciation amount in year 3 if using the SL method in year 3 ? e) What is the chosen final depreciation value for year 3