Use the following to answer questions 30 - 31: Bricker Enterprises purchased a machitre for $200,000 on September 30,2020 . The estimated service life is ten yeats with a $20,000 residua value. Bricker records partial-year depreciation based on the number of months in service. 30. Depreciation expense for 2020 , using double-declining balance, would oo: a. $10,000 b. $8,000 c. $9,000 d. $40,000 e. none of the choices is correct. 31. Depreciation expense for 2021 , using double-declining balance, would be: a. $34,000. b. $40,000. c. $32,000. d. $38,000. e. none of the choices is correct