Answer:
Percentage increase by 50%.
Explanation:
Initial Value = 60
Final Value = 90
[tex]\begin{gathered} \%\text{ of change=}\frac{Final\; Value-Initial\; Value}{Initial\; Value}\times100 \\ =\frac{90-60}{60}\times100 \\ =\frac{30}{60}\times100 \\ =\frac{1}{2}\times100 \\ =50\% \end{gathered}[/tex]Since our result is positive, there is a percentage increase by 50%.
