14 aved JK Builders Co purchases a new excavator costing 40,000. Its expected useful life is 10 years, at which point it is anticipated that the excavator will have a residual value of 6,000. ut of If the reducing-balance method of depreciation is used, at a rate of 15 per cent per annum, what is the net book value of the excavator at the end of 3 years? Select one: O a. 15,435 O b. 19,120 O c. 20,880 O d. 24,565