Percentage increase is 13.33%.
$\text{% increase} = \dfrac{ \color{red}{ \text{final value} } - \color{blue}{ \text{initial value} } }{ \color{blue}{ \text{initial value} } } \times 100$ | $$ \begin{aligned} \color{red}{ \text{final value} } &= 170 \\[1.5em] \color{blue}{ \text{initial value} } &= 150 \end{aligned} $$ |
$\text{% increase} = \dfrac{ \color{red}{ 170 } - \color{blue}{ 150 } }{ \color{blue}{ 150 } } \times 100 $ | |
$\text{% increase} = 0.1333 \times 100 $ | |
$\text{% increase} = 13.33 \% $ |