which one can i choose i did first and secound it's incorrect

7 View previous attempt 1 points On January 1 2021, Canseco Plumbing Fixtures purchased equipment for $30,000. Residual value at the end of an estimated four-year service life is expected to be $2,000. The company expects the equipment to operate for 10,000 hours. The equipment operated for 2.200 and 3,000 hours in 2021 and 2022, respectively. Required: a. Calculate depreciation expense for 2021 and 2022 using straight-line method. b. Calculate depreciation expense for 2021 and 2022 using double-declining balance method. c. Calculate depreciation expense for 2021 and 2022 using units of production using hours operated eBook Complete this question by entering your answers in the tabs below. Required A Required B Required Calculate depreciation expense for 2021 and 2022 using units-of-production using hours operated. (Round "Depreciation per machine hour answers to 2 decimal places.) Select formula for Units of Production Depreciation: (Cost - Residual)/Total units of production (Cost - Residual) / Total units of production (Cost - Residual) / Useful life in periods Cost / Total units of production SL rate x Beginning period book value Machine hours in 2022 Depreciation in 2022 $ 3,000 8.400 Mc IM