How would figure out the depreication for each year? I am confused on how to calcualte the time, amount of years, for each depreication.

Stellar Delivery Service had the following transactions related to its delivery truck: Year 1 Mar. 1 Purchased for $32,500 cash a new delivery truck with an estimated useful life of five years and a $6,850 salvage value Mar. 2 Paid $600 for painting the company name and logo on the truck. Dec. 31 Recorded depreciation on the truck for the year. Year 2 July 1 Installed air conditioning in the truck at a cost of $1,808 cash. Although the truck's estimated useful life was unaffected, its estimated salvage value was increased by $400. Sept 7 Paid $450 for truck tune-up and safety inspection Dec. 31 Recorded depreciation on the truck for the year Year 3 Sept 3 Dec. 31 Installed a set of front and rear bumper guards at a cost of $145 cash. Recorded depreciation on the truck for the year. Year 4 Dec. 31 Recorded depreciation on the truck for the year. Stellar's depreciation policies include (1) using straight-line depreciation, (2) recording depreciation to the nearest whole month, and (3) expensing all truck expenditures of $150 or less. Required