has several miles of access road that needs a A rural subdivision new surface treatment. Alternative 1 is a gravel base and pavement with an initial cost of $500,000 that will last for 15 years and has an annual upkeep cost of $100 per mile. Alternative 2 implies just to enhance the gravel base at a cost of $50,000 now. This alternative will require an annual coating of the surface with a durable hot oil mix at a cost of $130 per barrel applied starting at the end of year 1. Annual reapplication of the mix is required for the infinite life of the surface. A barrel covers 0.05 mile ?? If the interest rate is 6% per year, determine the number of miles at which the two alternatives break even