Depreciation of an asset based on the number of hours of usage is a(n) O accelerated method O replacement method O time-based method O activity-based method The Sahara Company purchased equipment on January 1, 2015, for $100,000. The equipment had an es useful life of five years, and estimated lifetime output of 18,000 units. In 2016, the company produced 4 $22,000. What depreciation method did the company use? O double-declining-balance method O units-of-output method O sum-of-the-years'-digits method O straight-line method