Extra Financial Services uses the units of activity method of depreciation. The company's fiscal year end is December 31. The following transactions and events occurred during the first three years: 2019 March 31 Purchased a bus for the employees for $4,500 cash plus value-added tax of $250. Nov.1 incurred ordinary repairs on the bus of $600. Dec. 31 Recorded 2019 depreciation on the basis that the bus has a four-year life in which it can drive for 100,000 kilometers, and estimated salvage value of $750. The actual kilometers in 2019 were 10,000 kilometers only. Based on the given information above, the depreciation expense for the bus in 2019 would be: Select one: O a. 750 O b. 675 c. 400 Od. 650