In recent years, ABC Company purchased two machines. Each machine has a different method. Information concerning the machines is summarized below. Machine Acquired Cost Depreciation Depreciation Method rate A 1/1/18 100 000 B 1/1/18 Straight-line 10% Declining- 20% balance 180 000 The amount of accumulated depreciation on each machine at December 31, 2020 is : O a. 30 000 for machine A and 36 000 for machine B O b. 30 000 for machine A and 64 800 for machine B . None of the above d. 30 000 for machine A and 28 800 for machine B