Change of Accounting Estimate Reliable Delivery Company purchased a fleet of delivery trucks with a newly developed fuel system that burns used textbooks. At the beginning of the third year of operating the trucks, the company concluded that the original estimated useful life of 6 years was overly conservative and a total useful life of 10 years was more appropriate. The total cost of the trucks was

$260,000, and the estimated salvage value is $20,000. Reliable uses straight-line depreciation.

a. Compute the depreciation expense for years 2, 3, and 4.

b. Give all journal entries needed in the third year.