all the answers i found don't provide me with the correct and complete-detailed answer that makes me understand the steps in a perfect way especially when it comes to solving the SL for Asset 3 as well as part B about the switchover.. I asked the same question before but it seems that the answer is copied from an old answer already available which doesn't provide me with a clear solution and full explanation of the steps especially solving SL Asset 3 as well as part B which is really important. so please I want a detailed and clear explanation of each step in this question.

Question 3: A manufacturing company has purchased three assets: Item Initial cost Book life MACRS class Salvage value Book depreciation Lathe $45,000 12 years 7 years $3,000 DDB Asset Type Truck $25,000 200,000 miles 5 years $2,000 Unit production (UP) Building, $800,000 50 years 39 years $100,000 SL The truck was depreciated by the units-of-production method. 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