Mary purchased 4 tires by mail order. she paid $63.40 per tire plus $6.80 per tire for shipping and handling. there is no sales tax, because the tires were purchased out of state. she also had to pay $7.56 per tire for mounting and balancing. at a local store, mary's total for the 4 tires with mounting and balancing would be $368 plus 88% sales tax. how much did mary save by purchasing the tires through the mail?