On 1/1/2011, ABC Company purchased a piece of equipment costing $60,000. The equipment is expected to have a useful life equal to 4 years and a salvage value equal to $10,000.

What is the depreciation expense for each for the following years under

i) straight-line depreciation method

ii) double-declining balance method

ii) sum-of-years'-digits' method?

Depreciation expense for year

2011

2012

2013

2014

Straight-line

Double-declining

Sum-of-years'-digits