Mary purchased 4 tires by mail order. She paid ​$54.70 per tire plus​ $5.90 per tire for shipping and handling. There is no sales​ tax, because the tires were purchased out of state. She also had to pay​ $7.06 per tire for mounting and balancing. At a local​ store, Mary's total for the 4 tires with mounting and balancing would be ​$324 plus 6​% sales tax. How much did Mary save by purchasing the tires through the​ mail?