A company purchased a truck on October 1 of the current year at a cost of $40,000.

The truck is expected to last six years and has a salvage value of $2,200. The company's annual accounting period ends on December 31.

a. What is the depreciation expense for the current year, assuming the straight-line method is used?

b. What is the depreciation expense for the current year, assuming the double-declining balance method is used?