Novak Company purchased machinery on January 1, 2017, for $100,000. The machinery is estimated to have a salvage value of $10,000 after a useful life of 8 years. a. Compute 2017 depreciation expense using the double-declining-balance method.

Depreciation expense

b. ?Compute 2017 depreciation expense using the double-declining-balance method, assuming the machinery was purchased on October 1, 2017.

Depreciation expense