We know that 1 ton is the same as 2000 pounds. Then we have:
[tex]\begin{gathered} 2000\rightarrow1 \\ 20000\rightarrow x \end{gathered}[/tex][tex]\begin{gathered} x=\frac{20000}{2000} \\ x=10 \end{gathered}[/tex]Hence the car weighs 10 ton and therefore you would make $500