Xavier Company purchased a machinery on January 1, 2018 for P7,200,000. The machinery had useful life of 10 years with no residual value and was depreciated using the straight line method. In 2021, a decision was made to change the depreciation method from straight line to sum of years' digits. The estimate of useful life and residual value remained unchanged. What amount should be reported as depreciation for 2021? 1,260,000 b. 1,440,000 916,360 d 720,000 a. c