It's C, just look at where the points are.
Yes, if all 8 of the students shared the cost of $100 dollars equally, that would mean each student paid $12.50.
I'm not sure what you mean, but if you mean 15 and 1/20th, you just multiply 15 by 20 and add one which is 301 and keep the denominator
You forgot to put the problem but choose answers that will divide evenly
