An office building was bought on 1st April of 20x1 at a cost of 54,300 . The useful life was estimated to be 25 years with a residual value of 12,000. What are the depreciation charge and the net book value on December 31st, using the straight-line method Year Gross value Depreciation for the year Accumulated depreciation NBV 20x1 54,300 20X2 54,300