(3) A city has a number of intersections that currently have a traffic count of 25,000 cars daily, expected to increase by 1,000 cars/day annually. The State Department of Transportation has estimated that a new set of traffic signal systems for the intersections will cost $500,000 and save each car passing through an average of $0.025 in fuel, wear and tear, and time. It will cost $25,000/year to operate the systems. If the interest rate is 6% and the systems are expected to last for 15 years, what is the net present worth of the projects? Assume that costs and savings occur at the end of the year. (10 points)