please answer with steps

Problem 3: A manufacturing company has purchased three assets: Asset Type Truck $25,000 200,000 miles Building $800,000 Item Initial cost Book life MACRS class Salvage value Book depreciation Lathe $45,000 12 years 7 years $3,000 DDB 50 years 39 years 5 years $2,000 Unit production (UP) $100,000 SL Usage of the truck was 22,000 miles and 25,000 miles during the first two years, respectively. (a) Calculate the book depreciation for each asset for the first two years. (b) If the lathe is to be depreciated over the early portion of its life by the DOB method and then by a switch to the SL method for the remainder of its life. When should the switch occur