which one ?

ABC Company uses double-declining balance depreciation method with fractional years rounded to the nearest whole month. On April 1, 2018, ABC Company purchased a building at a cost of $550,000. Useful life of the building was estimated to be 40 years with salvage value of $5,000. What is depreciation expense of the building for the year of 2018? Select one: a. $20,625 b. $22,916.6 c. $27,500 Od.$20,437.5