Percentage increase is 152.98%.
$\text{% increase} = \dfrac{ \color{red}{ \text{final value} } - \color{blue}{ \text{initial value} } }{ \color{blue}{ \text{initial value} } } \times 100$ | $$ \begin{aligned} \color{red}{ \text{final value} } &= 4.25 \\[1.5em] \color{blue}{ \text{initial value} } &= 1.68 \end{aligned} $$ |
$\text{% increase} = \dfrac{ \color{red}{ 4.25 } - \color{blue}{ 1.68 } }{ \color{blue}{ 1.68 } } \times 100 $ | |
$\text{% increase} = 1.5298 \times 100 $ | |
$\text{% increase} = 152.98 \% $ |