$1.$ On January $2017,$ Marima Pharmacy bought machinery for P$48,000.$ It was decided that this machinery should be depreciated using the straight$-$line method over a period of $10$ years with an estimated residual value of P$4,000.$ On $1$ January $2019,$ the directors decided to change the method of depreciation for the remaining life of the asset to $25\%$ reducing balance. Calculate the depreciation charge for the year ended $31$ December $2019.(8)$