A new engineer is evaluating whether to use a higher-voltage transmission line. It will cost $250,000 more initially, but it will reduce transmission losses. The optimistic, most likely, and pessimistic projections for annual savings are $20,000, $15,000, and $8,000, respectively. The interest rate is 6%, and the transmission line should have a life of 30 years. Using the range of estimates, compute the mean annual savings and net present worth (NPW) for the higher-voltage transmission line.