Lake Company bought a used delivery truck on January 1, 2017, for $20,000. The delivery truck was expected to remain in service 4 years (50,000 miles). Lake's accountant estimated that the trucks residual value would be $2,000 at the end of its useful life. The truck traveled 14,000 miles the first year and 18,000 miles the second year. Calculate depreciation expense for the truck for 2017 and 2018 using the

Straight-line method.

Double-declining balance method

Units of Production method.