3. At December 31, 2020, Pharoah decided to change the depreciation method on its office equipment from double-declining-balance to straight-line. The equipment had an original cost of $109,600 when purchased on January 1, 2018. It has a 10-year useful life and no salvage value. Depreciation expense recorded prior to 2020 under the double-declining-balance method was $39,000. Pharoah has already recorded 2020 depreciation expense of $12,000 using the double-declining-balance method.