We take as the 100% the 194070 miles from last year. Then, we apply a rule of three:
[tex]\begin{gathered} 194070\rightarrow100\text{ \%} \\ 329919\rightarrow x\text{ \%} \\ \Rightarrow x=\frac{329919\cdot100}{194070}=\frac{32991900}{194070}=170 \\ x=170\text{ \%} \end{gathered}[/tex]Since 329,919 is the 170% of last year's miles, then the increase was of 70%
