I have this probability questions on my study guide that I cannot figure out.?

Question

In a high school the students are evenly divided among the four classes (freshman, sophmore, junior, senior). The student body is ethnically diverse, with EACH CLASS LEVEL made up of 40% Latinos, 30% African Americans, 20% white adn 10% Asians. Each student claims one ethnicity. If a student is selected at random from this school, what is the probability that the student is:

I put my answers in, when reviewing I am having second thoughts about my answers. If you can help me that would be great. I have a test tomorrow and I emialed my teacher the other day and I have not heard anything back. I want to make sure I understand

Asisan or white = 30/100 = 30%
Non Asian = 90/100 = 90%
A junior or senior = 25/100 = 25%
Not a freshman = 75/100= 75%
A Latino senior = 40/100= 40%
Etiher a senior or a Latino = 65/100 = 65%
An African American sophomore = 30/100 = 30%
Either a sophomore or African American = 75/100 = 75%

Answer 1

Asian or white=20%+10%=30%
Non asain=90%
Junior or senior=25%+25%=50%
Not a freshman=75%
A latino senior=25%*40%=10%
Either senior or latino=25%+40%=65%
An african american sophmore=25%*30%=7.5%
Either sophomore or african american=25%+30%=55%

I figure you got most of them right, but there were a few that were slightly off.