A company has the opportunity to sell an old machine. The machine is fully depreciated to a zero book value but could be sold for $5,000. If the company did not sell the machine, it would be able to use it for four more years and save $3000 in pretax costs in each of those years. The company has a 10% cost of capital and is in the 35% marginal tax bracket. Calculate net present value and internal rate of return.