please show all work. use pw depreciation formulas ( ddb and SL ). answer is given in red.

Henry has an assignment from his boss at Czech Glass and Wood Sculpting to evaluate depreciation methods for writing off the $200,000 first cost of a newly acquired Trotec CO2 laser system for engraving and cutting. Productive life is 8 years and the salvage value is zero. Calculate the PW of depreciation at 10% per year if the depreciation can be switched between DDB and SL. PW of depreciation =$146,236