Answer :
[tex]Difference\ of\ 20\ and\ 8\\
20-8=12\\\\
\frac{12}{8}*100\%=\frac{1200}{8}\%=150\%\\\\
150\%\ is\ percent\ of\ change\ from\ 8\ to\ 20\ feet.[/tex]
Percent change between 8 and 20 feet is:
[tex] =\frac{20 - 8}{8} X 100\%\\\\ = \frac{12}{8}X100\% \\\\ =1.5 X 100\%\\\\=\boxed{150\%\ Answer}[/tex]
[tex] =\frac{20 - 8}{8} X 100\%\\\\ = \frac{12}{8}X100\% \\\\ =1.5 X 100\%\\\\=\boxed{150\%\ Answer}[/tex]