Suppose the City of Kitchener purchases five electrical sidewalk plows worth $20,000 each to be used over 10 years. Determine the annual payments the City is responsible for if the interest rate is constant at 2%. Suppose the benefits of having cleared sidewalks in the neighbourhood these snowplows will be used are estimated at $20,000 each winter, and the annual operating costs are $450 per plow, should the City make this investment? Show your work