Francisco owns a machine that it purchased on July 1, 2019 for $600,000. The machine had an estimated useful life of 8 years and an estimated residual value of $10,000. The company uses straight-line depreciation and records monthly depreciation. The machine was sold on December 31, 2024 for $350,000. What was the depreciation expense for 2019? Select one: a. $36,875 b. 573,750 c. $75,000 d. $30,729