Answer:
The first one is asking how many students prefer to go to the aquarium. There are 40 students in total. To calculate percentage you divide the amount to the total.
8 students want to go to the aquarium so you would divide 8/40 = .2
0.2 = 20%
So 20 percent of students want to go to the aquarium.
For the teachers who want to go to the aquarium you do the same thing.
13/50 = .26 = 26%
Hope this helped. :)