Answer:
29.05% of cookies sold were oatmeal cookies.
Explanation:
Students sold chocolate chip cookies = 145
Students sold oatmeal cookies = 95
Students sold sugar cookies = 87
Total cookies sold = 145+ 95 + 87
Total cookies sold= 327
The formula used to find percentage is :

Now, finding percent of the cookies sold that were oatmeal
Percentage of oatmeal cookies sold =

Percentage of oatmeal cookies sold = 29.05 %
So, 29.05% of cookies sold were oatmeal cookies.