Mary purchased four tires by mail order she paid $57.70 per tire plus $4.60 per tire for shipping and handling. There is no sales tax because the tires were purchased out of state she also had to pay $8.43 per tire for mounting and balancing. At a local store, Mary's total for the 4 tires with mounting and balancing would be $312 plus 7% sales tax. How much did Mary save by purchasing the tires through the mail