Answer: $26.50
Step-by-step explanation:
At Tire Mart, the tires cost 4(122.57)=$490.28, and thus the flat fee was $65.
At Fast Wheels, the fires cost 4(136.71)=$546.84, and thus the flat fee was $38.50.
So, the difference was $65 - $38.50 = $26.50
