In recent years, Kingbird Company has purchased three machines. Because of frequent employee turnover in the accounting department, a different accountant was in charge of selecting the depreciation method for each machine, and various methods have been used. Information concerning the machines is summarized in the table below. For the declining balance method, Kingbird Company uses the double-declining rate. For the units-of-activity method, total machine hours are expected to be 44,000 . Actual hours of use in the first 3 years were 2021, 600; 2022, 4,800; and 2023, 7,900. (a1) For Machine \#33, calculate depreciable cost per hour under units-of-activity method Depreciable cost perhour Compute the amount of accumulated depreciation ch each machine at December 31, 2023