Equipment was purchased by Potter, Inc. on January 1, 2019 at a cost of $100,000. The equipment has an estimated salvage value of $20,000 and an estimated useful life of 8 years or 20,000 hours. The equipment is to be depreciated using the units of activity depreciation method What is the amount of depreciation expense for the 2019 calendar year, if the equipment was used for 3,000 hours in 2019? $10,000 $12,000 $12,500 $15,000