On January 1, Walker Inc. acquired equipment for $80,000. The expected useful life is 10 years and the residual value is $1,600. Total service hours for the equipment are estimated to be 20,000 while actual hours for the year were 1,800. Compute depreciation expense for the year under the following methods. Note: Carry all decimals in calculations; round the final answer to the nearest dollar. a. Straight-line Answer 7,840 b. Sum-of-the-years-digits Answer 0 c. Double-declining-balance Answer d. Units-of-production Answer 0