On January 1, 2019, Loeffler Company acquired a machine at a cost of $200,000. Loeffler estimates that it will use the machine for 4 years or 8,000 machine hours. It estimates that after 4 years the machine can be sold for $20,000. Loeffler uses the machine for 2,100 and 1,800 machine hours in 2019 and 2020, respectively.

Required:

Compute depreciation expense for 2019 and 2020 using the

(1) Straight-line,

(2) Double declining-balance, and

(3) Units-of-production methods of depreciation?