8-45 For a vehicle that you or a friend owns, determine the number of miles driven per year. Find three alterna- tive sets of 4 tires that differ in their tread warranty. Assume that the life of the tires equals the tread war ranty divided by the number of miles driven per year. Compare the EUACs of the tires. (a) For what interest rates is each choice the best? (b) Develop a graph equivalent to Figure 8-4 to illustrate the results. (c) For the interest rate that is in the "middle" of your range, how low and how high can the num- ber of miles each year be without changing the best choice