Recall that the percent difference is given by the following formula:
[tex]P=\frac{|I_0-I|_{}}{\frac{I+I_0}{2}}\times100,[/tex]where I is the final value, and I₀ is the initial value.
In this case, I₀=80, and I=65, therefore:
[tex]P=\frac{80-65}{\frac{80+65}{2}}\times100.[/tex]Simplifying the above calculations we get:
[tex]P=\frac{15}{\frac{145}{2}}\times100=\frac{30}{145}\times100=\frac{6}{29}\times100=\frac{600}{29}\text{.}[/tex]Answer: 600/29%.
