Answer: According to the information the following equation can be constructed for the unknown tire price x, the equation is:
[tex](1.1)x+60<593.50\rightarrow(1)[/tex]The solution to the equation (1) is as follows:
[tex]\begin{gathered} (1.1)x+60\lt593.50 \\ \\ (1.1)x\lt593.50-60 \\ \\ (1.1)x\lt533.5 \\ \\ x<\frac{533.5}{1.1} \\ \\ x<\$485 \\ \\ \text{ The answer is \lparen a\rparen} \end{gathered}[/tex]