All right, so the first step would be to find the area of both the center and the whole.
The formula for area of a circle would be
[tex]A= \pi r^2[/tex]
The radius of the whole would be 17.5 in, and the radius of the center would be 3.5 in. Let's plug them in.
Whole:
[tex]A= \pi *17.5^2[/tex]
[tex]A=962.11[/tex]
Center:
[tex]A= \pi 3.5^2[/tex]
[tex]A=38.48[/tex]
To find the percentage, you would just have to find the fraction and turn it into a percent.
[tex]38.48/962.11=0.04[/tex]
That's 4/100, so it would be 4%.
