Radius: 11
Diameter: 22
I think all you have to do is double it for diameter
She made 20 oatmeal cookies
4/5 = 0.8
0.8 x 25 = 20
Your original price would have been $16.23
Take the new markup price and divide it by the percent it was marked up
17.85 / 1.10 = 16.227
1.10 represents 110%
Round your ending number because there are only two place holders after the decimal for calculating prices. By doing this we change $16.227 to $16.23.