∴ The sample size of this sampling survey is120;

(2) The number of people who like literature and history = 120- 12-36-24=48 (people),

As shown in the figure,

(3) Among the students surveyed, the percentage of students who like art books best =12 ÷120 =10%;

The degree of the central angle of art in the fan-shaped statistical chart = 360×10% = 36;

(4) 120? 12? 36? 24 120×5000=2000 (Ben),

The school will buy 2000 extra-curricular books about the history of this article.

So the answer is120; 10,36 .