A newspaper made a sample survey to find out the views of Suzhou citizens on the causes, effects and countermeasures of large-scale haze weather, and one of them asked.

(1) According to the meaning of the question: 30÷ 15%=200 (people), and the number of C-level students is 200× 10%=20 (people).

Then the number of Grade A students is 200-(30+20+10+130), accounting for 130200× 100%=65%, and n = 1-.

So the answer is: 200; 65%; 5%;

(2) As shown:

(3) According to the meaning of the question: 360× 65% = 234;

So the answer is: 234.