6. Mast Corporation uses straight-line depreciation and closes its books every December 31. The company purchased factory equipment on April 1, 2021, for $48,000. It is estimated that the equipment will have a $6,000 salvage value at the end of its 10-year useful life. After recording adjusting entries, the balance of Frost's Accumulated Depreciation account at December 31, 2022, will be a. $3,600 b. $8,400. c. $3,150. d. $7,350