Nanxun ancient town is a famous tourist attraction in China. Here is a passage about the charging standard between a school team and a tour guide of a travel agency Leader: how much is the charge for a tour to Nanxun? Tour guide: if the number of people does not exceed 30, the per capita travel cost is 360 yuan Leader: if more than 30 people, how to get a discount? Tour guide: if there are more than 30 people, the per capita travel expenses will be reduced by 5 yuan for each additional person, but the per capita travel expenses shall not be less than 300 yuan (1) If a group of 20 people go on a tour, the school will give the total cost to the travel agency_____ Yuan (2) The school's travel agency charges a total of 12400 yuan to the travel agency after the end of the group tour, asking for the number of the school's tour to Nanxun; 2. In the plane rectangular coordinate system, take points a, B, C and D as vertices to form a parallelogram, where points a (2, N + 1), B (n-1, N + 4) and C (- 5-N, N + 5) are all on the same inverse scale function image, then n=____ The coordinates of vertex D are____ .

Nanxun ancient town is a famous tourist attraction in China. Here is a passage about the charging standard between a school team and a tour guide of a travel agency Leader: how much is the charge for a tour to Nanxun? Tour guide: if the number of people does not exceed 30, the per capita travel cost is 360 yuan Leader: if more than 30 people, how to get a discount? Tour guide: if there are more than 30 people, the per capita travel expenses will be reduced by 5 yuan for each additional person, but the per capita travel expenses shall not be less than 300 yuan (1) If a group of 20 people go on a tour, the school will give the total cost to the travel agency_____ Yuan (2) The school's travel agency charges a total of 12400 yuan to the travel agency after the end of the group tour, asking for the number of the school's tour to Nanxun; 2. In the plane rectangular coordinate system, take points a, B, C and D as vertices to form a parallelogram, where points a (2, N + 1), B (n-1, N + 4) and C (- 5-N, N + 5) are all on the same inverse scale function image, then n=____ The coordinates of vertex D are____ .

&(1) suppose that the cost of the school to the travel agency is y yuan, and there are x people in the team, which can be expressed by the equation y = 360x & nbsp; (x ≥ 30) & nbsp; & nbsp; & nbsp; & nbsp; (1) y = x [360-5 (X-30)] & nbsp; (X & gt; 30 & nbsp; and & nbsp; 360-5